monkey land.not lonely
何時才會停止嘲笑這一切
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May 26, 2006
9的奧妙
任何數字加9,都可以變回該數字,例如:5+9=14,4+1=5
任何數字乘以9,都可以變成9,如:9*5=45,4+5=9
有沒有妙到?
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