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maithao.tb.dn
2 năm trước
một mảnh vườn trồng 3 loại cây:cam, chanh, hồng.Biết rằng số cây chanh bằng 2/3 tổng số cây cam và cây hồng.Còn số cây hồng bằng tổng số cây canm và cây chanh.Tính xem mỗi loại có bao nhiêu cây
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