设y=y(x)由方程x=3t^2 2t 3

首先你的题目应该有点错误,应该是y=ln(1+t)吧.先求y=y(x)在x=3处的导数：y'=dy/dx=(dy/dt)/(dx/dt)=[1/(1+t)]/(2t+2)=1/[2(1+t)^2],当

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-

dy/dx=(dy/dt)/(dx/dt)=[2t/(1+t^2)]/[1-1/(1+t^2)]=2/t

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)]．

设y=y(x)由方程ysinx=cos(x-y)所确定,则y'(0)=x=0时cos(-y)=cosy=0,故y=π/2+2kπ,k∈ZF(x,y)=ysinx-cos(x-y)=0dy/dx=-(&

这是一个复合函数求导,y=y(x)所以求e^y的导数首先对整体求导,再对y求导即为e^y*y'xy的导数为y+x*y'(根据求导规则)所以两边求导可得e^y*y'-y-x*y'=0

因为lim(n->∞)(1+1/n)^n=e所以lim(t->∞)x(1+2x/t)^t=lim(t->∞)x[(1+2x/t)^(t/2x)]^(2x)=xe^2x所以∫（0,x+y)e^(t^2)

对两边求导：[-sin（x+y）]（1+dy/dx）+dy/dx=0-sin（x+y）-[sin（x+y）]dy/dx+dy/dx=0dy/dx=[sin(x+y)]/[1-sin(x+y)]

dy/dt=cost-cost+tsint=tsintdx/dt=-sintdy/dx=(dy/dt)/(dx/dt)=-t再问：为什么-tcost会分解成-cost+tsint~~~+_+知道了==

dy/dt=e＾t+te＾t=（1+t）e＾tdx/dt=e＾tdy/dx=（dy/dt）/（dx/dt）=1+t=2

网上有很多高数课后习题答案,你可以下载一个参考~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,原式

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.

dz=-dx-dy

就是先用隐函数求导法得到dx/dt,dy/dt,然后相除就得到dy/dx.x=1代入方程：x^2+5xt+4t^3=0,得：1+5t+4t^3=0,得：4t^3+4t+t+1=0,得：(t+1)(4t

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'

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)]=[