[討論] 消失的一元
甲、乙、丙三人住宿一晚共要付30元
甲、乙、丙各拿出10元交給伙計
伙計將30元拿給老闆,老闆說:算他們便宜一點,只拿了25元
並將5元拿給伙計,伙計在歸還途中,心生貪念
偷偷將2元藏進口袋
然後將3元分別退還給甲、乙、丙,甲、乙、丙各拿回1元 ~~~~~
問題來了,甲、乙、丙各拿回1元等於每人付了9元,9×3=27元
再加上伙計偷了2元,27+2=29 29不等於30 少了1元,跑去哪了???
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