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你算反了.這題很早就有了 給30退5塊就等於花了25塊,對嗎? 又給了夥計2塊,對嗎? 那就說明總共花了25+2=27塊,對嗎? 3*9=27,對嗎? 27=27,對嗎? 還有什麼好疑惑的? 這題的關鍵就在於你把夥計的2塊加了兩次
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