设f(x)=则f{f[f(x)])等于().
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设z=f(x2-y2),则dz 等于: A. 2x-2y B. 2xdx-2ydy C. f’(x2-y2)dx D.2f’(x2-y2)(xdx—ydy)
设 z=f(x2 - y2),则 dz 等于:(A) 2x-2y (B) 2xdx-2ydy (C) f (x2 - y2)dx (D) 2 f(x2 - y2)(xdx- ydy)
设函数z=x2ey,则全微分dz=_______.
设函数z=ln(x+y2),则全微分dz=_______.
设z=sin(xy)+2x2+y,求dz.
设z=xy,则dz=()