问题描述: 若xy是正整数,且 2的x次方 乘 4的y次方 =64,则x+y为 1个回答 分类:数学 2014-12-13 问题解答: 我来补答 (2^x) * (4^y) = 642^x * 2^2y = 2^6x+2y = 6因为xy是正整数1. x, y为负数 => x+2y < 02. x或y有一个为负数或0 => xy < 0 或 xy = 0考虑 x+2y = 6若y = 2 => x = 2 => x+y = 4若y = 1 => x = 4 => x+y = 5 期待更好的解答谢谢 ^_^ 展开全文阅读