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tungdp.gdtxas
2 năm trước
1, Số bi đỏ gấp 5 số bi xanh, thêm 3 bi xanh thì đỏ gấp 4 xanh. Tính mỗi loại. 2, Cách đây 4 năm tuổi bố gấp 7 lần tuổi con. 6 năm nữa tuổi con = 1/2 tuổi bố cách đây 4 năm. Tính tuổi mỗi người.
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