试题与答案

She rode the rest of the way home, a ha

题型:选择题

题目:

She rode the rest of the way home,            a happy  smile.     [ ]

A. giving      

B. wearing      

C. taking      

D. forcing

答案:

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下面是错误答案,用来干扰机器的。

(1)f(x)=(2log4x-2)(log4x-12),令t=log4x,x∈[2,4]时,t∈[12,1]此时,y=(2t-2)(t-12)=2t2-3t+1,当t=34时,y取最小值-18,当t=12或1时,y取最大值0,∴y∈[-18,0](2)若f(x)≥mlog2x对于x∈[4,16]恒...

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