题目
16 单选 (4分)设 =f(x,xy,xyz), f可微,则偏导数计算正确的是 () .-|||-A. dfrac (partial u)(partial y)=x(f)_(2)+x=(f)_(3)-|||-① B. dfrac (partial u)(partial x)=(f)_(1)+(f)_(2)+(f)_(3)-|||-C. dfrac (partial u)(partial u)=xve-|||-bigcirc D. dfrac (partial u)(partial x)=(1+y+yz)f'
题目解答
答案
