What is the sum of the largest true fraction and the smallest false fraction whose unit of fraction is (1/9).
分数单位是(1/9)的最大真分数与最小假分数的和是多少．
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

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

<gadget id="calculator">9 / 9</gadget>
<output>1</output>

<gadget id="calculator">(8/9) + 1</gadget>
<output>17/9 = around 1.888889</output>

<result>17/9 = around 1.888889</result>