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phamtienthanh101
2 năm trước
Cuối năm học tại một trường THCS có 1200 đội viên đạt danh hiệu cháu ngoan bác hồ thuộc bốn khối 6, 7, 8, 9. Trong đó số đội viên khối 6 chiếm 2\5 tổng số, số đội viên khối 7 chiếm 25% tổng số, số đội viên khối chín bằng 1 4\5 số đội viên khối 8. Tìm số đội viên đạt danh hiệu cháu ngoan bác hồ của mỗi khối.
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