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jenda.htth
2 năm trước
1 trang trại có 150 con gà và vịt. Sau khi bán đi 20 con vịt thì số vịt còn lại kém số gà là 8 con. Hỏi lúc đầu mỗi loại có bao nhiêu con ? Gấp , 5 phút nữa :<
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