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Nusmydream
2 năm trước
cần gấp tổng hai số bằng 6,95 . Tìm hai số đó , biết nếu số hạng thứ 1 gấp lên 5 lần và số hạng thứ 2 gấp lên 3 lần thì được tổng mới = 25,2
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