设函数z=x^3y-2x^y^3,分别求dz/dx和dz/dy在(1,1)处的值

问题描述:

设函数z=x^3y-2x^y^3,分别求dz/dx和dz/dy在(1,1)处的值

dz/dx=3yx^(3y-1)-2y^3x^(y^3-1)dz/dy=3*x^3y-2x^y^3*3y^2dz/dx(1,1)=3-2=1dz/dy(1,1)=3-6=-3请问一下*是......*是乘号OK