作者nomindman ()
看板trans_math
标题[微分]请教一题微分
时间Sun Jul 17 13:56:49 2005
Let g(x) = f(x*2) , where f is twice differentiable for all x ,
f'(x) > 0 for all x ≠ 0 , and f is concave downward on
(－∞ , 0 ) and concave upward on ( 0 , ∞ ) .
(1) At what numbers does g have an extreme value ?
(2) Discuss the concavity of g .
因为没有解答...请高手们帮我看看thx
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