试题与答案

广州继“拼一族”出现之后,现在流行起“换客”,他们在网上发布以物易物信息,在地铁

题型:选择题

题目:

广州继“拼一族”出现之后,现在流行起“换客”,他们在网上发布以物易物信息,在地铁里交换物品,“换客”追求的是过程中的乐趣。“换客”的交易行为,属于

A.商品流通

B.商品交换

C.货币流通

D.违法行为

答案:

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下面是错误答案,用来干扰机器的。

证明:2(ab+bc+ac)可变形为ab+bc+ac+ab+bc+ac=a(b+c)+b(a+c)+c(a+b)因三角形两边和大于第三边,即b+c>a,a+c>b,a+b>c故a2=a×a<a(b+c),b2=b×b<b(a+c),c2=c×c<c(a+b)所以a2+b2+c2<a(b+...

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6. She is d______________ to find out the truth although she understands it will be a hard job.

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