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六年级：进价50，售价70，卖到剩7个，以原价8折售出共获利702...
六年级利润问题，以50元/个价格购进一批书包，售价70元/个，当卖到剩下7个时，以原价的8折售出，共获利702元，求书包数量？
六年级应用题专项110/181
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