17. In the mixed recurring decimal 2.718281, add another dot indicating recurrence at a certain position to make the newly generated recurring decimal as large as possible. Please write down the new recurring decimal.
17.【Solution】The 7th digit after the decimal point should be as large as possible, so the dot should be placed on 8, making the new repeating decimal $2.71 \dot{8} 28 \dot{1}$.