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是54的因數,又是9的倍數.即54≥9n≥9(n為非0自然數) 6≥n≥1 所以,n=1、2、3、4、5、6 即:9*1=9、9*2=18、9*3=27、9*4=36、9*5=45、9*6=54 我是:9、18、27、36、45、54
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