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MGSM / 梅兰妮是一名上门推销员。她在绿房子卖掉了三分之一的吸尘器,在红房子多卖了 2 台,在橙房子卖掉了剩下吸尘器的一半。如果 Melanie 还剩下 5 台吸尘器,她…

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梅兰妮是一名上门推销员。她在绿房子卖掉了三分之一的吸尘器,在红房子多卖了 2 台,在橙房子卖掉了剩下吸尘器的一半。如果 Melanie 还剩下 5 台吸尘器,她一开始有多少台吸尘器?

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