题目:
Luckily, I ______ as one of the players this time. [ ]
A.choose
B.chose
C.am chosen
D.choice
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)f′(x)=x-ax=x2-ax(x>0)---------(2分)若a≤0,则f′(x)≥0,所以此时只有递增区间(0,+∞)-----------------------------(4分)若a>0,当f′(x)>0时,得x>a,当f′(x)<0时,得0<x<a...