y=x-ln(1+e^x)的微分速度跪求!
问题描述:
y=x-ln(1+e^x)的微分速度跪求!
答
dy=d(x-ln(1+e^x))
=dx-d(ln(1+e^x))
=dx-d(1+e^x)/(1+e^x)
=dx-e^xdx/(1+e^x)
=dx/(1+e^x)