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lethichinhtamth
2 năm trước
Trung bình cộng của 3 số là 85. Nếu thêm 1 chữ số 0 vào bên phải số thứ hai thì được số thứ nhất, nếu gấp 4 lần số thứ hai thì được số thứ ba. Tìm ba số đó
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