X is a positive integer, 2-height of X is defined as the greatest negative integer n where 2 ^n is a factor of X. K and M are two positive integers. Whether 2-height of K is greater than 2-height of M? 1. K is greater than M 2. K is even times of M 答案选B 请问为什么？这道题要求2的K次方大还是2的M次放大。（1）中不是说K >M吗？而且K和M都是正整数，那（1）中肯定是2^K>2^M的呀... 不明白为什么选B 哪位指点一下？
(1) k>m, means nothing. (2) k/m= (a/b) * (2^k/2^m) = 2^e; A, b must be odd number, or you can extract at least one more 2, which gonna change k or m. So in this case, (a/b) must be 1, otherwise it would be a fraction. In a word, k-m=e. K>m.
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发表于 2011-2-3 22:23:21
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