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2 năm trước
học sinh khối 7 đã quyên góp được số sách nộp cho thư viện. Lớp 7/1 có 37 học sinh lớp 7/2 có 37 học sinh lớp 7/3 có 40 học sinh lớp 7/4 có 36 học sinh. Hỏi mỗi lớp quyên góp được bao nhiêu quyển sách cũ biết rằng số sách quyên góp được tỉ lệ với số học sinh của lớp với lớp 7/3 góp nhiều hơn 7/4 là 8 quyển
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