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Nắm vững thế nào là biểu thức đại số
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Làm bài tập:4,5/27/SGK- Bt:1,2,3,4,5/9-10/SBT
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Đọc trước bài Gía trị của biểu thức đại số
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Hướng dẫn BT5
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Một quý có ba tháng nên số tiền một quý bằng
số tiền một tháng nhân ba
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