The function f is defined for each positive three-digit integer n by f(n)=2^x乘以3^y乘以5^z, where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m)=9f(v), then m-v=? 答案是20，请问有高手会做吗？
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发表于 2010-3-17 15:36:10
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