tổng 3 hộp bi có 150 viên số bi thứ nhất bằng 1/5 số bi của 2 hộp còn lại. số bi của hộp thứ hai hơn số bi hộp thứ ba 25 viên .tìm số bi của mỗi hộp ai lm xg trc mik sẽ cho CTLHN nha

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