设z=f(x2-y2),则dz 等于:A. 2x-2y B. 2xdx-2yd

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问题 设z=f(x2-y2),则dz 等于:A. 2x-2yB. 2xdx-2ydyC. f’(x2-y2)dxD.2f’(x2-y2)(xdx—ydy)

选项 A. 2x-2y
B. 2xdx-2ydy
C. f’(x2-y2)dx
D.2f’(x2-y2)(xdx—ydy)

答案 D

解析
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