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thanhthuyanhung1978
2 năm trước
Số học sinh của hai lớp 7A và 7B tỉ lệ 8 và 9. Số học sinh lớp 7B nhiều hơn số học sinh lớp 7A là 5 học sinh. Vậy số học sinh lớp 7A và 7B lần lượt là
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