x的a的x次方的导数等于u(x)=x^a,外部是y=u^a
所以你需要用复合函数求导公式求导
dy/dx = dy/du du/dx = au^(a-1) *ax^(a-1) = a y/(x^a) * ax^a/x = a^2 y/x =a^2x^a^a/x
x的a的x次方的导数,这是复合函数,内部是u(x)=x^a,外部是y=u^a
所以你需要用复合函数求导公式求导
dy/dx = dy/du du/dx = au^(a-1) *ax^(a-1) = a y/(x^a) * ax^a/x = a^2 y/x =a^2x^a^a/x。
