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Nnbtran1218
2 năm trước
Có 4 trường cử học sinh tham gia lao động Nếu lấy 3/5 số học sinh của trường thứ nhất chia đều cho 3 trường kia thì số học sinh của 4 trường bằng nhau. Nếu trường thứ nhất bớt đi 40 em thì khi đó số học sinh ở trường thứ nhất bằng tổng số học sinh của 3 trường kia. Hỏi trung bình mỗi trường cử bao nhiêu em?
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