设函数y=y(x)由方程x^2e^2y

xy+e^y=y+1（1）求d^2y/dx^2在x=0处的值：（1）两边分别对x求导：y+xy'+e^yy'=y'y/y'+x+e^y=1(2)(2)两边对x再求导一次：(y'y'-yy'')/y'^

d(y^2)/dx=d(y^2)/dy*dy/dx=2y*dy/dx这个复合函数求导法则正如ovtr0001仁兄所说那样,你可以翻翻课本这个……还要详细点呀?你有书么?你看书那里不懂可以提出来,我可能

左右对x求导有y'/y=sec²(xy)(y+xy')整理有y'=y²/(cos(xy)-xy)所以dy=(y²/(cos(xy)-xy))dx

lny+x/y=0等式两边求导：y'*1/y+1/y+x*y'(-1/y²)=0(1/y-x/y²)y'=-1/y∴y'=(-1/y)/(1/y-x/y²)=-y/(y-

两边对x求导2x+2y*dy/dx=0dy/dx=-x/y有不明白的追问再问：刚学不太明白，2x+2y*dy/dx=0里的dy/dx哪来的，是y'吗？再答：是的复合函数求导注意这里y是x的函数不妨换个

由隐函数微分法可得：－sin(x＋y)(1＋y′)＋y′＝0－sin(x＋y)＋[1－sin(x＋y)]y′＝0∴y′＝sin(x＋y)／[1－sin(x＋y)]．

两边都对x求导有（2x+dy/dx)/(xˆ2+y)=3xˆ2y+xˆ3dy/dx+cosx得dy/dx=(3xˆ4y+3xˆ2yˆ2+x&

这个题目要利用隐函数的求导法则.则sin(x^2+y)=xy（两边同时求导,还要结合复合函数的求导法则）cos（x^2+y）*（2x+y′）=y+xy′2xcos（x^2+y）-y=xy′-y′cos

两边对x求导：y'e^y+(1+y')cos(x+y)=0,1）这里可得到y'=-cos(x+y)/[e^y+cos(x+y)]再对1）求导：y"e^y+(y')^2e^y+y"cos(x+y)-(1

直接求导,用xy表示导数【欢迎追问,

xy+y^2-2x=0y+xy'+2yy'-2=0(x+2y)y'=2-yy'=(2-y)/(x+2y)dy/dx=(2-y)/(x+2y)

分别对y求导,求左边为1+【e^(x+y）×（dx/dy+1）】右边为2×dx/dy推的dx/dy：自己算下,没得草稿纸.

对y^2－2xy＝7求微分,得2ydy-2(ydx+xdy)=0,∴（y-x)dy=ydx,∴dy/dx=y/(y-x).

两边对x求导得：2yy'*f(x)+y^2f'(x)+f(x)+xf'(x)=2x得：y'=[2x-xf'(x)-y^2f'(x)]/(2yf(x)]dy=[2x-xf'(x)-y^2f'(x)]/(

e^y-e^x=xy两边求导,得e^y*y'-e^x=y+xy'(e^y-x)y'=(e^x+y)所以y'=(e^x+y)/(e^y-x)x=0时,e^y-e^0=0,则e^y=1,则y=0所以y'(

ln(x+y)=x·lny(1+y‘)/(x+y)=lny+x/y·y‘y+y·y‘=y(x+y)lny+x(x+y)·y‘y‘=【y(x+x)lny-y】/【y-x(x+y)】再问：лл����

/>e^y+xy+e^x=0两边同时对x求导得：e^y·y'+y+xy'+e^x=0得y'=-(y+e^x)/(x+e^y)y''=-[(y'+e^x)(x+e^y)-(y+e^x)(1+e^y·y'

F(x,y)=x^2+y^2-ln(x+2y)Fx=2x-1/(x+2y)Fy=2y-2/(x+2y)F(x)=-Fx/Fy=-[2x(x+2y)-1]/[2y(x+2y)-2]

化为：e^(ylnx)-e^y=sin(xy)两边对x求导：e^(ylnx)(y'lnx+y/x)-y'e^y=cos(xy)(y+xy')y'[lnxe^(ylnx)-e^y-xcos(xy)]=[