What is the difference between the largest true fraction and the smallest false fraction whose denominator is 9?
分母是9的最大真分数与最小假分数的差是多少．
<gadget id="calculator">9 / 9</gadget>
<output>1</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 - (8/9)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>