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答案：
D
Alice去年的
入每月一样，她每月都会存下同样多的钱
年末，她存下的钱，是她每月收入中没存的钱的三倍
她去年省下的所有钱都是来自她的收入，她每月省下了收入的分数？
设月薪y，所求为 X，12*y*X=3*（y—y*X），X=1/5 
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