求隐函数导数ln(xy)=e^(x+y)所确定的隐函数y=y(x)的导数dy/dx.刚才问题写错,是这个

问题描述:

求隐函数导数ln(xy)=e^(x+y)所确定的隐函数y=y(x)的导数dy/dx.
刚才问题写错,是这个

[ln(xy)]' = [e^(x+y)]'
(xy)'/(xy) = e^(x+y) * (x+y)'
(y + xy')/(xy) = e^(x+y) *(1 + y')
y' = y[e^(x+y) -1]/[x(1 - ye^(x+y)]