y=[ln(1-x)]^4y的导数=4[ln(1-x)]^3*1/(1-x)*（-1)=4/(1-x)*[ln(1-x)]^3dy=4/(1-x)*[ln(1-x)]^3dx复合函数求导,从外向里依次求导此题也是,先将ln(1-x)看成一个数,求导之后乘以对数函数的导数,再乘以1-x求导的结果微...