题目:
下列命题正确的是
(A) 若函数f(x)在(-∞,+∞)内处处可微,则其导函数f’(x)必处处连续.
(B) 若函数f(x)在点x0可微,则当△x→0时,△y与dy是同阶无穷小.
(C) 设函数y=f(u)二阶可导,则由dy=f’(u)du知
d2y=d[f’(u)du]=[f’(u)du]’du=f"(u)(du)2.
(D) 若函数f(x)在点x0可导,则f(x)在点x0可微分.
答案:
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