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myhanh
2 năm trước
Tìm số có 4 chữ số, biết rằng nếu ta xóa đi chữ số tận cùng bên trái của số đó thì ta được số mới bằng $\frac{1}{17}$ số phải tìm. Cho biết chữ số bị xóa là chữ số 2.
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