题目:
Indian authorities have decided to remove the dry coconuts from trees near the building to ensure Mr Obama will not become the _________ of falling coconuts.[ ]
A. witness
B. victim
C. criminal
D. consultant
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意得,f(x0)=ax0=2,∴f(3x0)=a3x0=(ax0)3=8,(2)∵0<a<1,∴函数f(x)=ax在定义域上递减,∵f(2x2-3x+1)≤f(x2+2x-5),∴2x2-3x+1≥x2+2x-5,即x2-5x+6≥0,解得x≥3或x≤2,故x的取值范围是{x|x≥3或x≤2}.