Write the largest fraction so that its numerator is 1, and the decimal it changes to is a purely recurring decimal with only one digit in the recurring section. How many.
写出一个最大的分数，使它的分子是1，并且它所改成的小数是循环节只有一位的纯循环小数．多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>