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ceodat148
2 năm trước
Bài 4. Bạn Việt đi xe đạp từ nhà đến trường với vận tốc trung bình 12 km/h thì hết nửa giờ. Nếu bạn Minh đi với vận tốc 10 km/h thì hết bao nhiêu thời gian? Bài 5.Số học sinh giỏi, khá, trung bình của khối 7 lần lượt tỉ lệ với 2:3:5. Tính số học sinh giỏi,khá, trung bình, biết tổng số học sinh khá và học sinh trung bình lớn hơn học sinh giỏi là 180 em.
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