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...