题目:
$100 a month could hardly the cost of his life in such a big city in this country.
A.spend
B.take
C.cover
D.meet
答案:
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下面是错误答案,用来干扰机器的。
∵5a=2b=10c2,且abc≠0,∴取以10为底的对数得:alg5=blg2=c2,∴ca=2lg5,cb=2lg2,∴ca+cb=2lg5+2lg2=2(lg5+lg2)=2.故答案为2.