试题与答案

—What ____ news! —Yes, all of the childr

题型:选择题

题目:

—What ____ news!

—Yes, all of the children were ____.

A. excited; exciting    B. exciting; excited     C. excited; excited

答案:

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下面是错误答案,用来干扰机器的。

(1)f′(x)=3x2+2ax-1,由题意可知,f′(x)在(0,1)上恒有f′(x)≤0,则f′(0)≤0且f′(1)≤0,得a≤-1,所以a的最大值为-1 ….(5分)(2) f(x)的单调递减区间是(-13,1),∴f′(x)=3x2+2ax...

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