Mathematics, 15.06.2021 17:30 Lovely7290

Bạn Nam mua 10 cây bút bi gồm hai loại bút bi xanh và bút bi đỏ.Giá tiền một cây bút bi xanh là 4 nghìn đồng, giá tiền một cây bút bi đỏ là 5 nghìn đồng. Tổng số tiền bạn Nam phải trả là 43 nghìn đồng. Hỏi bạn Nam đã mua bao nhiêu cây bút bi xanh, bao nhiêu cây bút bi đỏ

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Bạn Nam mua 10 cây bút bi gồm hai loại bút bi xanh và bút bi đỏ.Giá tiền một cây bút bi xanh là 4 ng...

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