题目内容:
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)
A.见图A
B.见图B
C.见图C
D.见图D
参考答案:
答案解析:
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)
A.见图A
B.见图B
C.见图C
D.见图D