In a glass of sugar water, sugar accounts for 1/10 of the sugar water, and how much sugar accounts for water.
在一杯糖水中，糖占糖水的(1/10)，糖占水的多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(1/10) / (9/10)</gadget>
<output>1/9 = around 0.111111</output>

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