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lethanhnam
2 năm trước
tổng của 2 số tròn chục liền trước số 73, nếu tăng số hạng thứ nhất lên 5 đơn vị và giảm số hạng thứ 2 đi 6 đơn vị thì tổng mới là bao nhiêu?
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