arctan(ax)求导

arctanx求导推导：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。求导是数学计算中的一个计算方法，它的定义就是，当自变量的增量趋于零时，因变量的增量与自变量的增量之商的极限。在一个函数存在导数时，称这个函数可导或者可微分。可导的函数一定连续。不连续的函数一定不可导。基本函数的求导公式：1、y=c(c为常数) y"=0；2、y=x^n y"=nx^(n-1)；3、y=a^x y"=a^xlna；4、y=e^x y"=e^x；5、y=logax y"=logae/x；6、y=lnx y"=1/x；7、y=sinx y"=cosx；8、y=cosx y"=-sinx；9、y=tanx y"=1/cos^2x；10、y=cotx y"=-1/sin^2x；11、y=arcsinx y"=1/√1-x^2；12、y=arccosx y"=-1/√1-x^2；13、y=arctanx y"=1/1+x^2；14、y=arccotx y"=-1/1+x^2。

设x=tany那么tany"=sex^y那么arctanx"=1/(tany)"=1/sec^y所以sec^y=1+tan^y=1+x^2则(arctanx)"=1/(1+x^2)

首先结果是 1/(1+x^2)推导过程x=tany对x求导1=y"*sec^2y=>y"=1/sec^2y=1/(tan^2y+1)=1/(x^2+1）觉得好请采纳 不懂可以追问

到底是 y/arctanx 还是 arctan(y/x) 啊？前者的导数等于 1/arctanx，后者的导数等于 (1/x) / [1+(y/x)^2] = x / (x^2+y^2) 。

arctanx的导数：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。 扩展资料 　　求导公式： 　　1、C"=0(C为常数)； 　　2、(Xn)"=nX(n-1) (n∈R)； 　　3、(sinX)"=cosX； 　　4、(cosX)"=-sinX； 　　5、(aX)"=aXIna （ln为自然对数)； 　　6、(logaX)"=1/(Xlna) (a>0，且a≠1)； 　　7、(tanX)"=1/(cosX)2=(secX)2

题目若 y 是 x 的函数， 应有 arctan(y/x) = ？ ， 构成方程才对头。

y=arctan(x/a)我先推导一下正切函数的求导公式，咳咳，因为忘了。我只记得复合函数求导法则和正余弦导数。现在来推吧。tan(x)"={sin(x)×[1/cos(x)]}"=cos(x)×[1/cos(x)]+sin(x)×[-1/cos^(2)(x)]×[-sin(x)]=1+tan^(2)(x)，不要化简成sec^(2)(x)了，那样不好算。继续求题目所求。tan(y)=x/atan(y)"=(x/a)"[1+tan^(2)(y)]×y"=1/ay"=(1/a)/[1+(x/a)^2]=a/[a^(2)+x^(2)]

如下图，供参考。

1.(atctanx)"=1/(tany)"=1/sec^2y=1/(1+tan^2y)=1/(1+x^2)利用反函数求导法则2.lim(h-->0)(arctan(x+h)-arctanx)/h3.令arctan(x+h)-arctanx=u,tanu=h/[1+(x+h)x]h=(1+x^2)tanu/(1-xtanu)4.=limu(1-xtanu)/(1+x^2)tanu=1/(1+x^2)5.tanu等价uarctangent（即arctan）指反正切函数，反正切函数是反三角函数的一种，即正切函数的反函数。一般大学高等数学中有涉及。

arctanx求导推导：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。求导是数学计算中的一个计算方法，它的定义就是，当自变量的增量趋于零时，因变量的增量与自变量的增量之商的极限。在一个函数存在导数时，称这个函数可导或者可微分。可导的函数一定连续。不连续的函数一定不可导。基本函数的求导公式：1、y=c(c为常数) y"=0；2、y=x^n y"=nx^(n-1)；3、y=a^x y"=a^xlna；4、y=e^x y"=e^x；5、y=logax y"=logae/x；6、y=lnx y"=1/x；7、y=sinx y"=cosx；8、y=cosx y"=-sinx；9、y=tanx y"=1/cos^2x；10、y=cotx y"=-1/sin^2x；11、y=arcsinx y"=1/√1-x^2；12、y=arccosx y"=-1/√1-x^2；13、y=arctanx y"=1/1+x^2；14、y=arccotx y"=-1/1+x^2。

(atctanx)"=1/(tany)"=1/sec^2y=1/(1+tan^2y)=1/(1+x^2) 利用反函数求导法则lim(h-->0)(arctan(x+h)-arctanx)/h令arctan(x+h)-arctanx=u ,tanu=h/[1+(x+h)x] h=(1+x^2)tanu/(1-xtanu)=limu(1-xtanu)/(1+x^2)tanu=1/(1+x^2)tanu等价uArctangent（即arctan）指反正切函数，反正切函数是反三角函数的一种，即正切函数的反函数。一般大学高等数学中有涉及。

arctanx求导推导：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。求导是数学计算中的一个计算方法，它的定义就是，当自变量的增量趋于零时，因变量的增量与自变量的增量之商的极限。在一个函数存在导数时，称这个函数可导或者可微分。可导的函数一定连续。不连续的函数一定不可导。基本函数的求导公式：1、y=c(c为常数) y"=0；2、y=x^n y"=nx^(n-1)；3、y=a^x y"=a^xlna；4、y=e^x y"=e^x；5、y=logax y"=logae/x；6、y=lnx y"=1/x；7、y=sinx y"=cosx；8、y=cosx y"=-sinx；9、y=tanx y"=1/cos^2x；10、y=cotx y"=-1/sin^2x；11、y=arcsinx y"=1/√1-x^2；12、y=arccosx y"=-1/√1-x^2；13、y=arctanx y"=1/1+x^2；14、y=arccotx y"=-1/1+x^2。

arctanx求导推导：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。求导是数学计算中的一个计算方法，它的定义就是，当自变量的增量趋于零时，因变量的增量与自变量的增量之商的极限。在一个函数存在导数时，称这个函数可导或者可微分。可导的函数一定连续。不连续的函数一定不可导。基本函数的求导公式：1、y=c(c为常数) y"=0；2、y=x^n y"=nx^(n-1)；3、y=a^x y"=a^xlna；4、y=e^x y"=e^x；5、y=logax y"=logae/x；6、y=lnx y"=1/x；7、y=sinx y"=cosx；8、y=cosx y"=-sinx；9、y=tanx y"=1/cos^2x；10、y=cotx y"=-1/sin^2x；11、y=arcsinx y"=1/√1-x^2；12、y=arccosx y"=-1/√1-x^2；13、y=arctanx y"=1/1+x^2；14、y=arccotx y"=-1/1+x^2。

arctanx的导数：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。 扩展资料 　　1、导数的四则运算（u与v都是关于x的函数） 　　（1）（u±v）"=u"±v" 　　（2）（u*v）"=u"*v+u*v" 　　（3）（u/v）"=（u"*v-u*v"）/v 　　2、导数的基本公式 　　C"=0（C为常数）、（x^n）"=nx^(n-1)、（sinx）"=cosx、（cosx）"=-sinx、（tanx）"=secx、（secx）"=tanxsecx 　　3、求导例题 　　（1）y=4x^4+sinxcosx，则（y）"=（4x^4+sinxcosx）" 　　=（4x^4）"+（sinxcosx）" 　　=16x^3+（sinx）"*cosx+sinx*（cosx）" 　　=16x^3+cosxx-sinxx 　　=16x^3+cos2x 　　（2）y=x/（x+1），则（y）"=（x/（x+1））" 　　=（x"*（x+1）-x*（x+1）"）/（x+1） 　　=（（x+1）-x）/（x+1） 　　=1/（x+1）

arctanx求导推导：y=arctanx，x=tany，dx/dy=secy=tany+1，dy/dx=1/(dx/dy)=1/(tany+1)=1/(1+x)。求导是数学计算中的一个计算方法，它的定义就是，当自变量的增量趋于零时，因变量的增量与自变量的增量之商的极限。在一个函数存在导数时，称这个函数可导或者可微分。可导的函数一定连续。不连续的函数一定不可导。基本函数的求导公式：1、y=c(c为常数) y"=0；2、y=x^n y"=nx^(n-1)；3、y=a^x y"=a^xlna；4、y=e^x y"=e^x；5、y=logax y"=logae/x；6、y=lnx y"=1/x；7、y=sinx y"=cosx；8、y=cosx y"=-sinx；9、y=tanx y"=1/cos^2x；10、y=cotx y"=-1/sin^2x；11、y=arcsinx y"=1/√1-x^2；12、y=arccosx y"=-1/√1-x^2；13、y=arctanx y"=1/1+x^2；14、y=arccotx y"=-1/1+x^2。

1、反三角函数求导公式反正弦函数的求导：(arcsinx)"=1/√(1-x^2)反余弦函数的求导：(arccosx)"=-1/√(1-x^2)反正切函数的求导：(arctanx)"=1/(1+x^2)反余切函数的求导：(arccotx)"=-1/(1+x^2)2、反三角函数负数关系公式arcsin(-x)=-arcsin(x)arccos(-x)=π-arccos(x)arctan(-x)=-arctan(x)arccot(-x)=π-arccot(x)3、反三角函数倒数关系公式arcsin(1/x)=arccsc(x)arccos(1/x)=arcsec(x)arctan(1/x)=arccot(x)=π/2-arctan(x)(x＞0)arccot(1/x)=arccot(x)=π/2-arccot(x)(x＞0)arccot(1/x)=arctan(x)+π=3π/2-arccot(x)(x＜0)4、反三角函数余角关系公式arcsin(x)+arccos(x)=π/2arctan(x)+arccot(x)=π/2arcsec(x)+arccsc(x)=π/2

arctan求导方法：设x=tanytany"=secx^yarctanx"=1/(tany)"=1/sec^ysec^y=1+tan^y=1+x^2所以(arctanx)"=1/(1+x^2)反函数的导数与原函数的导数关系设原函数为y=f(x)，则其反函数在y点的导数与f"(x)互为倒数（即原函数，前提要f"(x)存在且不为0）反函数求导法则如果函数x=f(y)x=f(y)在区间IyIy内单调、可导且f′(y)≠0f′(y)≠0，那么它的反函数y=fu22121(x)y=fu22121(x)在区间Ix={x|x=f(y)，y∈Iy}Ix={x|x=f(y)，y∈Iy}内也可导，且[fu22121(x)]′=1f′(y)或dydx=1dxdy[fu22121(x)]′=1f′(y)或dydx=1dxdy这个结论可以简单表达为：反函数的导数等于直接函数导数的倒数。例：设x=siny，y∈[u2212π2,π2]x=sinu2061y，y∈[u2212π2,π2]为直接导数，则y=arcsinxy=arcsinu2061x是它的反函数，求反函数的导数.解：函数x=sinyx=sinu2061y在区间内单调可导，f′(y)=cosy≠0f′(y)=cosu2061y≠0因此，由公式得(arcsinx)′=1(siny)′(arcsinu2061x)′=1(sinu2061y)′=1cosy=11u2212sin2yu2212u2212u2212u2212u2212u2212u2212u2212√=11u2212x2u2212u2212u2212u2212u2212√=1cosu2061y=11u2212sin2u2061y=11u2212x2

根据题意，有：y=arctanxdy/dx=1/(1+x^2)。这个反正切函数的导数是基本导数公式，需要熟记。

arctan（即Arctangent）指反正切函数。反函数与原函数关于y=x的对称点的导数互为倒数。设原函数为y=f(x)，则其反函数在y点的导数与f"(x)互为倒数（即原函数，前提要f"(x)存在且不为0）。arctanx求导方法：令y=arctanx，则x=tany。对x=tany这个方程“=”的两边同时对x求导，则（x）"=（tany）"1=sec2y*（y）"，则（y）"=1/sec2y又tany=x，则sec2y=1+tan2y=1+x2得，（y）"=1/（1+x2）即arctanx的导数为1/（1+x2）。

英语日期的表达方法在日期方面，美英的表达方式是有差别的。以日为先，月份为后，此为英国式，美国式则与此相反。如二零零九年三月二日的写法：March 2, 2009（美），2nd March 2009（英）。在美式的写法中，1st， 2nd， 3rd的st， nd， rd是不使用的。由于日期书面表达不同，读法也不一样。如1987年4月20日，英式的写法是20th April 1987，读成the twentieth of April， nineteen eighty-seven；美式的表达是April 20,1987，则读成April the twentieth， nineteen eighty-seven。同样，全部用数字表达日期时，英美也有差别。1998年5月6日按照英国式应写成6/5/98，而按照美国式应写成5/6/98；01/08/1998是英国式的1998年8月1日，按照美国的表达方式却是1998年1月8日，美国的1998年8月1日应写成08/01/1998。扩展资料：日期的表示法1、日期的写法(书面语)和读法(口语)稍有不同：如“十月一日”可以写成October1October1st1stOctober(the)1stofOctober等表示月份的词也可用缩略式，如Oct.1，1Oct.但是在口语中通常只有两种读法October(the)first或thefirstofOctober。2、日期与星期排列时，通常是星期在前，日期在后。如：HearrivedonFriday，May10.他于5月10日(星期五)到达。3、日期的缩写以-first结尾的，写成数字就要加st。如：thirty-first，31st以-second结尾的，写成数字就要加nd。如：twenty-second，22nd以-third结尾的，写成数字就要加rd。如：thirty-third，33rd

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英文日期的正确书写方式英语中日期有两种写法，一种是按月、日、年的顺序排列，另一种是按日、月、年的顺序排列。将年份放在最后，其前用逗号与月、日隔开。1、把月份写在日期前面，这通常是美国写法。如：March21st,2001读作Marchthetwenty-first,twothousandandone2、先写日子，再写月份和年，这通常是英国写法。如：21stMarch,2001读作thetwenty-firstofMarch,twothousandandone还有就是月份也可以间写。扩展资料英语中的年份——四位数的年份，一般前两个数为一个单位，后两个数为一个单位，依次按基数词读出。如：1763年写作：1763；读作：seventeensixty-three或seventeenhundredandsixty-three2006年写作：2006；读作：twothousandandsix2063年写作：2063；读作：twentysixtythree或twentyhundredandsixty-three1050年写作：1050；读作：tenfifty或tenhundredandfifty2016.9.20英文日期写法2016.9.20英文日期写法是September20,2016.英文日期写法介绍：英文日期格式分为美式日期格式和英式日期格式，英式日期表达会先将日子写在前面，月份放在中间，也就是“日，月，年”的方式，美式日期表达会有一点差别，先写月份，通常为“月，日，年”的方式，例如：22,July,2020就是英式的表达法，July22,2020就是美式的表达法。关键词汇：September?音标：英[sep?temb?]??美[sep?temb?r]?n.??九月;?用法：September是公历一年中的第9个月份,农历中的“九月”是theninthmoon。泛指“9月”时,September前一般不加冠词。September可略写成Sept.。September在句中可用作定语修饰其他名词。例句：TheexhibitionwillbeopenedonSept.20.展览会将9月20日开幕。Itwasaboutthe23rd,September.时间大约在9月23日。IstartedmycourseatthebeginningofSeptember.我在9月初开始学习我的功课。02/07/2019怎么读日期平安信用卡卡片正面显示的数字是卡片有效期，如06/24，06代表月份，24代表年份，即有效期至2024年6月。如有疑问，您可以点击下方链接选择首页右上角在线客服图标-信用卡或者关注平安银行信用卡微信公众号进行咨询。应答时间：2021-03-04，最新业务变化请以平安银行官网公布为准。[平安银行我知道]想要知道更多？快来看“平安银行我知道”吧~英语日期的5种表达方式一、英式写法1.写法：2May,1988读法：thesecondofMay,nineteeneighty-eight2.写法：May2,1988读法：Maythesecond,nineteeneighty-eight二、美式写法写法：May2,1988读法：Maysecond,nineteeneighty-eight三、无论英国英语或美国英语，在需要突出年月日的场合，均可采用以下表达法。即写法：thesecondofMay,intheyear1988读法：thesecondofMay,intheyearnineteeneighty-eight四、书写时，还可以完全采用数字表示。这时，英国英语与美国英语在表达上大相径庭。即英国式：2.5.88；2-5-88；2/5/88美国式：5.2.88；5-2-88；5/2/88五、不论英国英语或美国英语，书写时，月份还常用缩略式。即January~Jan./JanFebruary~Feb./FebMarch~Mar./MarApril~Apr./Apr

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日期的书写分为英式与美式两种:1）英式的日期：日/月/年；Day/Month/Year2）美式的日期：月/日/年；Month/Day/Year拓展资料:①英式日期读写方式：eg.2018年5月13日1)书写：英式日期先写日期，后写月份。日期可以用基数词也可以用序数词，年份和月份中间用逗号隔开。以下几种方式都对：·13thofMay,2018·13thMay,2018·13May,2018·13-May-2018·13/05/2018·13.05.20182)读作：thethirteenthofMay,twothousandeighteen thethirteenthofMay,twentyeighteenthethirteenthdayofMay, twothousandeighteen②美式日期读写方式：eg.2018年5月13日1)书写：美式日期先写月份，后写日期。日期可以用基数词也可以用序数词，年份和日期中间用逗号隔开。以下几种方式都对：·May13th,2018·Maythe13th,2018·May13,2018·05-13-2018·05/13/2018·05.13.20182)读作：Maythethirteenth,twothousandeighteen Maythirteenth,twentyeighteen/twothousandeighteenMayThirteen, twothousandeighteen(非正式口语）

I am a middle school student .I have many lessons ,i like English ,because it"s interesting.And i don"t like math ,because it"s very difficult ,There are many theater in my nigeborhood ,I like Green theater,it"s very cheap there .About clothing store i like Bob"s clothing store they have friendly service ,and i don"t like Jack"s clothing store .Because it"s expensive.This are what I like and don"t like things.

英文日期书写分为英式和美式两种，英式是日月年，例如8th October,2014 或8 October,2014。而美式是月日年，例如October 8th,2014 或October 8,2014。相关如下英文时间格式的应用：1、无论英国英语或美国英语，在需要突出年月日的场合（尤其是在正式文件中），均可采用以下表达法。即（以“1988年5月2日”为例）。（1）写法：the second (day) of May, in the year (of) 1988（2）读法：the second (day) of May, in the year (of) nineteen eighty-eight2、书写时，还可以完全采用数字表示。这时，英国英语与美国英语在表达上大相径庭。即（以“1988年5月2日”为例）。（1）英国式：2. 5. 88；2-5-88；2 / 5 / 88（2）美国式：5. 2. 88；5-2-88；5 / 2 / 88

一身是胆是指生肖虎。一身是胆是指生肖虎。它出自诗歌：“一身是胆不畏强，九节神鞭鬼怪慌。腾起一跃惊天地，留下威名百兽王。”在东方，老虎象征着权力、热情和大胆。他是一个爱造反、引人注目，并难以捉摸的人物。他受到大家的敬畏，使人害怕他就像害怕真虎一样。他能使家庭避开三大灾难：火、贼和鬼。假如你对他那生龙活虎的性格能习惯，那么，在虎的周围会幸运，属虎人的活力和对生活的乐观具有感染力，他会唤起人们心中的各种感情，唯独没有冷漠，总之，吸引人的属虎者会成为人们注意的中心。由于他生来不知疲倦并有些鲁莽，因此通常行动很快。他生性多疑、摇摆不定，常做出草率决定，他很难相信其他人或平息自己的感情。他决不把事情憋在心里。同时，他又是一个诚实、柔情和慷慨的人，而且有奇妙的幽默感。每个属虎人都很仁慈，他爱婴儿、动物和爵士乐，或者爱一些能引起他幻想和注意的东西。他一旦卷入一件事，就会忘掉一切，甚至连呼吸都要为之而让位。他做事从来不三心二意，你可以相信他会使出百分之百的力量，甚至更大的力量来做事情。

英文日期分英式和美式。英式日期格式：日，月，年美式日期格式：月，日，年具体举例如下：1) 8th March,2004 或8 March,2004（英式）2) March 8th,2004 或March 8,2004 （美式）日期写法宜遵从下列规则：1)年份必须完全写明，不可用"04代替2004;2)月份必须用英文拼出或采用公认的简写，即 January (Jan.),February(Feb.),March(Mar.),April(Apr.),May,June,July,August (Aug.),September(Sept.),October(Oct.),November(Nov.),December(Dec.);3)日期可用序数词，如：1st,2nd,3rd,4th,...；也可用基数词，如：1，2，3，4，...。但美式大多采用后者；4)在年份和月日之间必须用逗号隔开；5)日期不可全部采用如7.12.2003或7/12/2003的阿拉伯数字书写，否则会引起误解。因为英美在这方面的习惯用法不同。按美国人习惯，上述日期为2003年7月12日，而按英国习惯则是2003年12月7日。6th April,1978 是英式英文的写法. April 6th, 1978 是美式英文的写法.(注意:日子和月份中间没有逗号.)6th,April,1978April 6th,1978April 6,1978 都正确关于日期的写法，应注意以下几点：①年份应完全写出，不能简写。②月份要用英文名称，不要用数字代替。③月份名称多用公认的缩写式。但 May, June, July, 因为较短，不可缩写。④写日期时，可用基数词1，2，3，4，5，……28，29，30，31等，也可用序数词 lst, 2nd, 3rd, 4th, 5th, ……28th, 29th, 30th, 31lst等。但最好用基数词，简单明了。日期可有下列几种写法：① Oct. 20, 2004② 10 May, 2004③ 3rd June, 2004④ Sept. 16th, 2004按美国习惯, ①最为通用日期的写法，月、日、年，月份用英文，日和年用阿拉伯数字。例如：2008年9月8日应写成：Sep. 8, 2008 或 09/08/2008

2011年12月31日的英语表达格式有以下几种：Dec.31,2011Dec.31st,2011Decemberthethirty-first,2011thethirty-firstofDecember,2011年份可以缩写，但一定要用","跟前面的日月隔开。

一身是胆”指的是生肖虎。出自诗歌“一身是胆不畏强，九节神鞭鬼怪慌。腾起一跃惊天地，留下威名百兽王。联：啸撼天地千神应，威震山林万兽从。”补充资料：寅虎，十二生肖之一，地支的第三位。虎被誉为兽中之王，凶猛彪悍，虎虎生威，凌晨3－5时（即“寅时”）。据古书载。这时候，老虎是最活跃、最凶猛、伤人最多，因为寅时同虎搭配。生肖虎的性格：喜欢出头，胆子很大，属虎的人是充满正气和正能量的人。具有忍耐力和霸气，虎是很有威风的那种，容易少年得志，不喜欢被人管束。

一身是胆指生肖虎。生肖虎出自诗歌：一身是胆不畏强，九节神鞭鬼怪慌。腾起一跃惊天地，留下威名百兽王。联：啸撼天地千神应，威震山林万兽从。属虎人，外见宽容，内心刚强，好勇好誉之性，有狭义之心。属虎人一身是胆，属虎女的性格比较要强，她们从来不认为自己是女生就要比男生差多少，不管是做什么事情，都有一种不服输的劲头，所以她们看起来非常的大胆有魄力，敢去做一般女生不敢做的事情，所以就算是独身走夜路，对她们来说也是小菜一碟而已！生活中有的人真的是胆子很大的，他们什么事情都敢做的，给人们的印象就是一个很勇敢的人，就像是属虎人一样的，即使是女人，她们在夜晚的时候也是一个人敢走夜路的，真的会让很多人都佩服的，做事方面也是从来都不会认输的。

英文日记通常由书端和正文两个部分组成。日记常以第一人称记下当天生活中的所见、所闻、所做或所想的事情。中、英文的日记三格式大致一样。英语日记的书端是专门写日记的日期、星期和天气的。左上角是日期(年、月、日)、星期。右上角写上当天的天气情况，如：Sunny, Fine, Rainy, Windy, Snowy, Cloudy等。 　　 日期表达有多种形式。年、月、日都写时，通常以月、日、年为顺序，月份可以缩写，日和年用逗号隔开。例如： December 18, 2003 或者 Dec. 18, 2003 　　　　 　　A) September 1, 2004或September 1st, 2004也可省略写成Sept. 1, 2004或Sept. 1st, 2004；B)the 1st of September in 2004(月份不可以缩写) 　　　　 　　B)只有月、日 　　　　 　　September 1或September 1st(月份可以缩写) 　　　　 　 C)只有年、月 　　　　 　　September 2004或the September of 2004(月份不可以缩写) 　　　　 　　以上的1或1st都应读作the first。 　　　　 　　2.星期也可以省略不写，可将其放在日期前或后，星期和日期之间不用标点，但要空一格，星期也可缩写。如： 　　　　 　　Saturday, October 22nd, 2004；October 22nd, 2004 Saturday 　　　　 　　3.天气情况必不可少。天气一般用一个形容词如 :Sunny, Fine, Rainy, Snowy 等表示。写在日期之后，用逗号隔开，位于日记的右上角。如： 　　　　 　　Saturday, March 4, 2004, Windy；1st January, 2004, Fine 　　　　

2016.9.20英文日期写法是:September 20,2016

一身是胆什么生肖：猴。因为一身是胆中的“身”和“申”是谐音，申对应的是十二生肖中的生肖猴，所以一身是胆是生肖猴。猴子是一个总称。灵长类中很多动物我们都称之为猴。灵长目是哺乳纲的1目，动物界最高等的类群，大脑发达；眼眶朝向前方，眶间距窄。手和脚的趾（指）分开，大拇指灵活，多数能与其他趾（指）对握。它也是中国十二生肖之一。猴是无臀的，所以坐不住，善於变动，与古时代诸侯性质很相近，古时候诸侯们各据一方，个个多计谋善变，狡猾欺诈的事各尽己能。所以当初形容各据一方的霸主如一群猴子的王一样，善指挥应变，因而诸侯的『侯』字是将猴的犬去除，代表人而成『侯』，其道理在此。在中国古籍中猴子的别称有禺，果然，独，狨等。据《白虎通》记述：“猴，侯也，见人设食伏机，则凭高四望，善于侯者也。”侯，是等待、观望的意思。猴是一个俗称。灵长目中很多动物我们都称之为猴。灵长目是哺乳纲的1目。动物界最高等的类群，大脑发达；眼眶朝向前方，眶间距窄；手和脚的趾（指）分开，大拇指灵活，多数能与其他趾（指）对握。

英文日期书写分为英式和美式两种，英式是日月年，例如8th October,2014 或8 October,2014。而美式是月日年，例如October 8th,2014 或October 8,2014。相关如下英文时间格式的应用：1、无论英国英语或美国英语，在需要突出年月日的场合（尤其是在正式文件中），均可采用以下表达法。即（以“1988年5月2日”为例）。（1）写法：the second (day) of May, in the year (of) 1988（2）读法：the second (day) of May, in the year (of) nineteen eighty-eight2、书写时，还可以完全采用数字表示。这时，英国英语与美国英语在表达上大相径庭。即（以“1988年5月2日”为例）。（1）英国式：2. 5. 88；2-5-88；2 / 5 / 88（2）美国式：5. 2. 88；5-2-88；5 / 2 / 88

A travel to ShanghaiAs we know, Shanghai is a famous financial centre of China. It is also a great place for holiday. This summer holiday, I went to Shanghai with my families. We went there by high-speed train. We had a lot of fun there. We saw the Oriental Pearl Tower. We took photos of animals in Shanghai wildlife Park. We went to the Bund. It is known as the "name card" of Shanghai. We ate the famous Nanshan Crab Soup Bun. We also visited the Shanghai Old City God"s Temple. We enjoyed ourselves very much. How wonderful the trip is. I"ll never forget it.

英文日期分英式和美式,如下: 1) 8th March,2004 或8 March,2004（英式） 2) March 8th,2004 或March 8,2004 （美式） 扩展资料 　　日期写法宜遵从下列规则： 　　1)年份必须完全写明,不可用"04代替2004; 　　2)月份必须用英文拼出或采用公认的"简写,January(Jan.),February(Feb.),March(Mar.),April(Apr.),May,June,July,August (Aug.),September(Sept.),October(Oct.),November(Nov.),December(Dec.); 　　3)日期可用序数词,如：1st,2nd,3rd,4th,...；也可用基数词,如：1,2,3,4,.但美式大多采用后者； 　　4)在年份和月日之间必须用逗号隔开； 　　5)日期不可全部采用如7.12.2003或7/12/2003的阿拉伯数字书写,否则会引起误解.因为英美在这方面的习惯用法不同.按美国人习惯,上述日期为2003年7月12日,而按英国习惯则是2003年12月7日.

英语作文，60~80词，要求在内。 你好这位同学，感谢你对英语牛人团的信任，我们在此响应你的作文求助。 由于我不大清楚你的暑假是怎么过的（哈哈），只能瞎编一点内容了，就是学生们一般暑假都会做的事情。绝对正确+地道的手工作文如下： My summer vacation is filled with exciting experiences. At the very beginning of the summer, my parents took me on a trip to Yunnan. We all loved the Lijiang Old Town, especially their delicious foods! Following the trip, I spent about o weeks on my homework. Afterwards, I signed up for a piano class. Since then I"ve been practising playing the piano for 2 hours every day. 一共67个单词。如果哪里需要解释说明欢迎你随时追问。 希望我的解答对你有帮助，祝你暑假愉快，学习进步 :-) 汶川地震的英语作文要求在60至80词 The thoughts of Wenchuan Earthquake 12th May,is a date that I"ve never fot it.Wenchuan earthquake, the people to disaster areas has caused tremendous physical and mental suffering,but also makes the map as a *** all region,the people throughout the country the most about the place. This is anatural disaster caused by difficult to avoid thetragedy, it is sad, Human nature is no stronger to disaster,and the natural power of human beings exposed pletely. In the earthquake disaster.Wen Jiabao said a word,"As longas both hands,wiu be able to rebuild their homes."thesewords to the real interpretation of the ture meaning of the disaster."Time is life."meaning at this point has been the most vivid expression. No valentine"s love of the natural disasters.In abottle to save the lives of all people,the victory will e after disaster test of the Chinese naturn. 关于电影的一篇英语作文，要求在60～80词～ 在百度上搜索 英语作文，要求在下面。60词，谢谢 实在没本事把字压缩在60词--- 委婉的表达是需要很多“废话”的。你自己再压压看。 May 10, 2012 Dear Madam/Sir， At first, we should apologize for failing to say "Hello" to you personally. But we are rather familiar with your family. Your kid and your pet dog have introduced themselves once and again with the paintings covering our door and appearances in our hall respectively. We have also learnt that you like the programs on TV, for we always hear the loud sound. Moreover we are considering that your apartment must be kept clean as the wastes are frequently thrown out of your door. Let"s take care for each other because we are the people live closest on earth. Best wishes. Sincerely Yours Your neighbors 高中英语作文:《Teenager"s pressure》﹐要求在内文!!! TEENAGER"S PRESSURE Adults always say the most valuable and cheerful time is when they were teenagers, as when you grow up, there are more worries and troubles. However, teenagers also have growing pains and pressures. First, due to the nature of overpopulation, Chinese teenagers have more academic pressure than other countries". There is fierce petition everywhere which forced teenagers to develop and obtain prehensive skills, that is also the reason why many parents paid excessive tutoring for their children. Moreover, there are endless asses *** ents and exercises, especially for students facing university entrance examinations. （课业压力） In addition, nowadays, teenagers have significantly better living conditions since the fast growing of China. They are living in the so-called “information age”, they have an easier aess to every corner of the world via inter. Thus, they are facing the pressure to be too addicted or distracted from these high-tech applications and cannot concentrate on their studies. （新生事物诱惑的压力） Furthermore, teenagers are more precocious than before and they fall in love earlier than their parents" decades. Thus, they face the pressure to deal with their more plicated relationships with friends and lovers. （早熟与早恋的压力） In general, recent teenagers faces more pressures than they used to and it is important for us to know, thus to help them release from these pressures as much as possible. 213个字 瞎编的 希望对你有帮助 英语作文，要求：60-80词，求助信 Maggie： Hi,I am lingling,I am here to asking for your help.last night,I came to a dancing party and weared my sister"s new shoes.I didn"t get her permission to wear her shoes.How unlucky!The shoes was broken and i don`t have enough money to get it repaired. I am afriad to tell my sister this.What can I do??Maybe I can mend it by myself??Please give me some suggests.Thanks a lot. LingLing 刚写完，希望对你有助喔。。 英语作文，要求60词 I have some habbits,some are good,but some are bad. I like reading very much.From reading science books,I get a lot of knowledge.From reading novels,I lose myself in the stories.I like doing sports,too.It helps me keep healthy.Also I never put today"s work till tomorrow.They are all my good habbits.They help me a lot in my daily life. However,I also have some bad habbits.For example,sometimes I do my homework slowly,and stay up till very late.During meals I prefer meat to vegetables.And sometimes I play puter games too long without having a reat.They are all harmful to my health. 建议你下个翻译软体，然后把你的作文编辑进去，会翻译出你要的作文。 希望采纳 求英语作文（60——80字内） As the economy increase, the life is being better than before. The situation that students celebrate their birthdays on restaurants is popular. The problem is that should we students go to a restaurant for our birthday. Some students say yes because it is helpful for improve friendship, and it also gave clas *** ates a chace to municate and relax. However, others against the ideal. The reasons are that it is a waste of money and resource, and it also lead a bad ethos. To conclude, i think we students should not go to a restaurant for our birthday. 一篇初三英语作文：travelling。要求60词至80词 Travelling I love travelling, not only for that I can enjoy the scenery, but I can learn about other places as well. I have gone to many places. While I was in primary school, my parents brought me to Chengdu, Sichuan province. I visit Du Fu"s home there, and learned a lot about the most famous poet in Chinese history. This is just one of my travelling experiences. Travelling is a pleasure for me. 【73 words】

you can take the 99 bus from airport and get off to library .after you conniue walking,wait a moment can see the , ﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋

日期的书写分为英式与美式两种:1)英式的日期:日/月/年;Day/Month/Year 2)美式的日期:月/日/年;Month/Day/Year 拓展资料:①英式日期读写方式:eg. 2018年5月13日 1) 书写: 英式日期先写日期,后写月份

1、英文日期分英式和美式，英式日期格式：Date,Month,Year；美式日期格式：“Month,Date,Year”。 2、具体举例如下： （1）8th March,2004或8 March,2004（英式）； （2）March 8th,2004或March 8,2004（美式）。

The Spring Festival is very important to Chinese people. In the past，people could not often have meat，rice or other delicious food. They could only eat these during the Spring festival. So every year they hoped that the Spring Festival would come soon. Now， although people‘s life is much better，and we can eat the delicious foods everyday. People still like the festival. Because most people can have a long holiday，and we are free to go on a trip or visit our friends or have parties with our family. In the evenings，we can have a big meal in the restaurant or stay at home with family and watch the TV programs.I like the Spring Festival very much. How wonderful the Spring Festival is！春节对中国人来说非常重要。在过去，人们往往没有肉，大米或其他美味的食物吃。他们通常只能在春节吃到这些。所以每年他们都希望春节可以快点来。现在，虽然人们的生活好多了，我们每天都可以吃美味的食物。人们仍然喜欢的春节。因为大多数人可以有一个很长的假期，我们可以自由地去旅行或拜访我们的朋友或与我们的家人聚会。晚上，我们可以在餐厅大吃一顿，或与家人留在家里看电视节目。我非常喜欢春节。春节是多么的美妙啊！

我的网友（My Net Friend） I was only nine years old when I learnt how to use a computer. My mother is my first teacher. I know how to type, how to copy a file, and how to visit a web site on the internet. One day, mom was not at home. I turned on the computer and began to learn how to chat on net. The first one I met there was a boy called tom. He greeted me politely. When he knew that I was only a 9-year-old girl, and almost knew nothing about chatting on net, he started showing me how to use the chatting tools, how to download, and how to send e-mails. I learnt a lot from him. 石器时代的人们(Stone Age People) Millions of years ago, people lived in caves. They had fire, which gave them heat and light. They eat raw meat. It was time for lunch. The father was very hungry. He was eating some raw meat. He gave the boy some raw meat. The boy threw the raw meat into the fire. The father was very angry. He said, “You are a bad boy! Eat this meat.” the father gave it to the boy. The boy tasted the meat. It tasted nice. He ate the cooked meat. He said, “I like this meat. it tastes good.” after that, the stone age family always cooked their food on the fire 修理电视机(repairing a TV set) On the eve of spring festival, people were making dumplings while watching TV. But suddenly our TV set didn"t work. Father was so anxious that he went to uncle lees. He felt glad to help and came with some tools. 除夕之夜,家家都在高兴地包饺子看电视.突然,我们家的电视坏了.这可急坏了爸爸,他急忙请隔壁的李叔叔帮忙.李叔叔欣然应允. After a moment he fixed the set. Our whole families were so pleased that we asked him to taste some dumplings of ours. 他带着工具,不一会儿就把电视机修好了.我们全家都很高兴,热情地请他吃饺子.上学路上(on the way to school） This morning, my father took me to school by bike. I sat at the back of the bike, eating a banana. After I ate it up, I threw the skin onto the street randomly. 今天早晨,爸爸骑车带我去上学.我坐在后车座上,吃着香蕉.吃完后,我顺手将香蕉皮扔到了街上. No sooner had I done this than I realized that I had done something bad to our environment. And maybe someone would step on it and tumble over. I must pick it up. Thinking of these, I asked father to stop. I jumped off the bike and ran back to pick up the banana skin and threw it into a roadside dustbin. Seeing this, father praised me and I felt very happy. 我马上意识到我的所作所为破坏了我们的环境,或许有人会踩在上面而跌倒,我必须把它拾起来.想到这些,我让爸爸停车.我跳下自行车,跑回去拾起香蕉皮,并扔到了路边的垃圾箱里.看到这些,爸爸表扬了我.我感到很高兴. In future I will protect the surroundings more consciously and think more about others. 将来我要更自觉地保护周围的环境,更多地为他人着想.网上英语聊天(chat in English on the internet) I am greatly interested in chatting on the net, especially in English. I still remembered the first time when I logged on the legend web site and met a girl called "orange”. 我非常喜欢网上聊天,尤其是英语聊天.我仍然记得第一次登录联想网站并在“英语沙龙”聊天室遇见“橘”姑娘的情景.我们谈了一些有趣的话题. We chatted about some interesting topics. I think I can practice my English well this way. 我想我可以通过这一方法练习英语.我的新牙刷(my new toothbrush) 　　oh! my god. my toothbrush was broken last sunday. i couldn"t brush my teeth. so i went shopping with my mother. there were so many tooth brushes. 　　finally we chose a blue one. there is a blue bird in it. it made in guangzhou. it is ten yuan. it"s too expensive. but it is so beautiful. and i like it very much. so we bought it. my mother said that it is good for my teeth. then we went home. i can brush my teeth now. how happy i am! 父亲给我的礼物 When I was young,my father ,who always taught me how to be a true man,told me that it is essential to be tolerant in your life whatever happens. And that remains the most valuable present he gave me,I think To be tolerant, I need to keep calm when great trouble lies in front of me,however difficult it is to overcome it; To be tolerant ,I need to resist the temptation of all kinds of the outside world,even if it is so attractive; To be torlerant, I need to pull myself(控制自己情绪) in times of extreme sorrows and joys, no matter how they affect me. Summer Camp On Saturday, we went camping, with our teachers. First we pitched the tent. then our older brothers and older sisters played game with us. At noon, we all had a delicious lunch followed by a barbecue for dinner. At night, we had bonfire and sang and danced. We didn"t sleep until 10:20 at night. But some of the boys were so noisy we couldn＇t fall alseep. I only slept for three hours. the next morning, everybody woke up very early. After exercising in the morning, we all went to see the small pigs. On the way there, we saw a lot of geese. At 10:00, we went back to eat ice cream. It was so cold. then, we all played games together. We ate lunch at 12:00. In the afternoon, we played musical instruments and sang. After that, camp was over. We had a lot of fun at the summer camp. I am looking forward o going to another summer camp soon. Reading Is a Good Hobby With development of science and technology, new knowledge comes every day. If you stop learning even for a day,you will be lost. Reading is a good way to help you keep in touch with the outside world. Read widely and you"ll be rich in knowledge. Reading is also a good way to relax yourself. You can get a lot of fun in the books. A good book is a good friend to comfort you when you are unhappy. So long as you have a good book at hand, you"ll never feel lonely. Every valuable book will open a new world before you. A piano player（我的理想） What do I want to do when I"m older? Someone wants to be a doctor. Someone wants to be a basketball player because they are good at sport. Someone wants to be a writer and to make the writing. Someone wants to be a teacher because they like teaching children. I like playing the piano and I good at it. So I want to become a piano player. Play the piano is very interesting. And you can learn something of music. Piano can make you like music. A lot of musician and singer are love playing piano. I play the piano when I"m ten years old. Now I"m in grand five. I hope when I"m sixteen years old , I can become grand eight. I"ll be harder and harder to practise. Become a piano play is a hard job. But I believe I can do it.

英语作文有：1、People always confuse about the meaning of happiness, they don’t know how to define it. 人们总是对幸福的意义感到困惑，他们不知道如何去定义。2、Once I read the story that the little eagles needed to practice flying in the cliff before they could fly.曾经我读到一个故事，小鹰需要在会飞前在悬崖上练习飞翔。3、My father is busy all the time, he always goes out very early and then goes home after very late. 我的爸爸一直很忙，他总是早出晚下班。4、Recently, the live show is very popular, especially the show about the father how to get along with their children.最近，真人秀很流行，特别是有关父亲如何与他们孩子相处的节目。5 、Last night, I read the news about a professor who wrote the paper 20 years ago. 昨晚，我阅读了一则新闻关于一位教授20年前写的一篇论文。6、When I am making mistakes, my parents will never be angry with me.当我犯错误的时候，父母从来不和我生气。7、On the New Year’s Eve, after finishing the dinner, for most Chinese people, they will sit at home, watching the Spring Festival Gala with their families. 在除夕夜，吃完晚饭后，对于大部分中国人来说，他们会在家里坐着，和家人观看春晚。8、When I was small, I was taught that we should help others, though it was not our duty, we should take no hesitation to do it. 当我还小的时候，我被教育我们应该帮助别人，虽然那不是我们的责任，但是我们应该毫不犹豫去做。9、We live in a world that surrounded by people, we need to communicate with others, for the purpose of share our emotions and keep survive. 我们生活在一个被人群包围的世界，我们需要和别人进行交流，为了和别人分享我们的情感和在这个世界生存。10、Before I was five years old, my parents gave me what I wanted, but as I became bigger, they changed their attitude towards me. 在我五岁以前，我的父母给予我想要的东西，但是随着我长大，他们对待我的态度发生了改变。

英语的写法通常与我们的中文相反,写日期时也应该注意顺序:英语日期的写法有两种： （1）先写某日，次写月份，最后写年份。某日用序数词的缩写形式；除May ， June和July三个月份外，其余各月份均可缩写；年份均用阿拉伯数字书写，但不能把“1991”缩写成“91”等。例如： 22nd August 2006 （2）先写月份，次写某日，最后写年份。用这种写法比较普遍。某日用基数词，也可用序数词的缩写形式（必须采用公认的简写），但后边须加逗号。例如： August 22，2006 August 22nd，2006 如果在英语日记的书端里要写星期的话，可将其写在日期的前面或后面。例如： Tuesday，August 22nd，2006 August 22nd ，2006，Tuesday总的说：日期表达有多种形式。年、月、日都写时，通常以月、日、年为顺序，月份可以缩写，日和年用逗号隔开。例如： December 18, 2003 或者 Dec. 18, 2003 September 1, 2004或September 1st, 2004也可省略写成Sept. 1, 2004或Sept. 1st, 2004；B)the 1st of September in 2004

exp代表的意思就是国外的日期。国外的日期是从小到大和中国相反，最先说的号，再说月，最后说年。1、Expirydate［ikˈspaiərideit］缩写为EXP，意思是失效期，有效期。Exp．date或Expixydate；Expirationdate；Expiring。这三组外文标志都是表示失效期。3、几个常用的标志和识别：Exp＝Expirydate到期日的简称。Usebefore或Useby在以前使用。Validity有效期。Duration有效期。Stability稳定期。Storagelife贮存期限。4、保质期是指产品在规定的贮藏条件下的质量保证期限。保质期一般在产品的外包装上，消费者容易看到的地方，一般食品、药品、护肤品、日用品等都会有保质期。5、在保质期内，产品的生产企业对该产品质量符合有关标准或明示担保的质量条件负责，销售者可以放心销售这些产品，消费者可以安全使用。扩展资料：英文日期书写格式注意事项：1、在写当年年份时必须完全写明，不可用＂16代替2016；2、书写月份时，必须用全英文的形式写出或者采用大家熟知的简写形式。3、书写年份和月日时，必须在年份和月日之间加上逗号，月日之间需要注意美式还是英式写法，逗号也有所不同；4、在日期的表达上，可用序数词，如：1st，2nd，3rd，4th，5th，．．．，当然也可以使用基数词，例如简单的：1，2，3，4，5．．．。一般在美式中大都采用基数词；5、完全用数字表达日期的时候我们也要注意，如7／8／2016，针对不同的国家采用不同的格式。按美国人习惯，上述日期为2016年7月8日，而按英国习惯则是2016年8月7日。参考资料来源：百度百科-药品期限

　　家乡，是追随我一生记忆的梦。那么关于我的家乡的 英语 作文 60词有哪些呢?以下是我为大家整理的，有关我的家乡英语作文60词，希望大家喜欢。 　　我的家乡英语作文篇一 　　My hometown is in Lianjiang. It is a city in the state of Guangdong. 　　The people here are mostly fruit farmers。Some of them work in the rice cooker industry.It is also one of the largest and most developed county in GuangDong. 　　Lianjiang is a traditional agricultural county. I live in one of the small town here in. 　　我的家乡英语作文篇二 　　I live in yushan. it"s a quite community. 　　Ther are mang old people living here .mang families with yong children live here and mang students live here ,too.There are a lot of tall buildings and small gardens in my community .My home is nan apartment building. 　　There are mang stores close to my home.the bank near pharmacy. 　　我的家乡英语作文篇三 　　My hometown has changed a lot.In the past the streets were dirty but they are quite clean now. 　　And today"s hometown is rather different from that of the past for example,the traffic was terrible in the past,but it"s safe now. 　　In a word,with the lead of the CPC.my hometown has been becoming more and more beautiful! 　　我的家乡英语作文篇四 　　My hometown is very beautiful, people want to stay here forever. 　　Get up every morning, we can see the smoke-filled lake, the sun shines on the top, the sparkling shine. 　　In my hometown, the most beautiful autumn.Every autumn, the maple leaf has become its mainstream.Fruit trees in front of the dolphin family but also to bear the full fruit. 　　I love home. 　　我的家乡英语作文篇五 　　My hometown used to be a backward place, because it was deep in the mountains, where there were no nice buildings and the roads were so narrow and dirty. People lived a poor life. While in recent years, with the development of society, my hometown has been greatly changed. Now the roads are getting much wider. 　　There are many different cars and buses running on the roads. Trees and flowers are planted on the two sides of the roads. 　　They can provide us with oxygen and fight against the pollutants. So the sky becomes cleaner and brighter. 　　What"s more, you can see many modern and beautiful buildings everywhere, and the living conditions are improving. 　　People are enjoying a comfortable life now. 　　我的家乡英语作文篇六 　　My hometown is Guiyang,a small city in Southwest China,surrounded by rolling green mountains.A river runs through it,with locust trees lining along both banks. 　　In Spring the locust trees all blossom at the same time,spreading the delicate fragrance all around the city. 　　In Summer there will be little boats floating on the river,the laughter of children resonating with the sound of the running water. 　　I was born and grew up in the city,and I"m very affectionate to it.It rains a lot,but the climate is very mild,neither too cold nor too hot throughout the year. 　　It is small and not very prosperous,but people there are warm-hearted and straightforward.The life pace there is slow and peaceful.It"s a good place for spending hot summer days. 　　That is my hometown.I love her deeply from the bottom of my heart.我的家乡英语作文60词相关推荐： 1. 我的家乡英语作文及翻译 2. 介绍我的家乡英语作文5篇 3. 我的家乡英语作文 4. 介绍动物英语作文60词 5. 我的家乡英语作文带翻译