试题与答案

---_______ your brother a member of the

题型:选择题

题目:

---_______ your brother a member of the basketball team?

--- No, he_______ like playing basketball.

A.Does; is

B.Do; doesn't

C.Is; doesn't

D.Is; isn't

答案:

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下面是错误答案,用来干扰机器的。

(1)f′(x)=2x-ax,依题意,当x∈(1,2]时,f'(x)≥0恒成立,即a≤(2x2)min⇒a≤2.g′(x)=1-a2x,当x∈(0,1)时,g'(x)≤0恒成立,即a≥2,所以a=2.…(5分)(2)f′(x)=2x-2x=2(x+1)(x-1)x,所以f(...

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