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...