设函数y=f(x)由方程ln根号下x2=y2-搜答案-拍题作业网

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-

z=x/ln(y/2)z′（x）=1/ln(y/2)z′（y）=-x/ln(y/2)^2*(1/(y/2))*1/2=-2x/(y*ln(y/2）^2)

x=0则lny=0y=1两边对x求导[1/(x²+y)]*(x²+y)'=3x²+cosx(2x+y')/(x²+y)=3x²+cosxy'=(x&s

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

x=z(lny-lnz)对x求导1=∂z/∂x*(lny-lnz)+z*(0-1/z*∂z/∂x)1=∂z/∂x(lny-lnz

不就是对x求导吗?把y看成中间变量y=y(x)说明要想导x要通过y这个中间变量两边对x求导:y^3+(3x*y^2)*dy/dx+(e^x)*siny+(e^x)*cosy*dy/dx=1/x下面你自

答：xy+ln(x+e^2)+lny=0……（1）两边对x求导：y+xy'+1/(x+e^2)+y'/y=0……（2）x=0代入（1）和（2）得：0+2+lny=0y+0+1/e^2+y'/y=0解得

方程两边对x求导得2x+y′x2+y＝3x2y+x3y′+cosxy′＝2x−(x2+y)(3x2y+cosx)x5+x3y−1由原方程知，x=0时y=1，代入上式得y′|x＝0＝dydx|x＝0＝1

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

把x=0代入方程,求得y=1,再利用隐函数求导法则,两边对x求导（可把y换成f(x),以免犯错）即有,左边为(1+y')/(x+y)右边为y^2+2xyy'+cosx将x=0,y=1代入从而(1+y'

两端对x求导数（把y看作x的函数）,则1-y'=e^(xy)*(1*y+x*y')y'[xe^(xy)+1]=1-ye^(xy)dy/dx=y'=[1-ye^(xy)]/[xe^(xy)+1]

见图再问：不好意思啊~题目看错了，题目如图啊~

xe^f(y)=ln2009e^ye^f(y)+xe^f(y)*f'(y)*y'=y'e^f(y)(1+xf'y')=y'e^f*f'*y

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)]/(

1.对x=ln(x+y）求微分,得dx=(dx+dy)/(x+y),∴dy=(x+y-1)dx,∴dy/dx=x+y-1.2.e^(xy)+y^3-5x=0,①求微分得e^(xy)*(ydx+xdy)

min是指f(x)g(x)h(x)三个函数中的最小值

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]

两边对x求导：1+y'=y'e^y得dy/dx=y'=1/(e^y-1)