For a watermelon, Dad and Xiaoming each ate (1/4) of it, and Mom ate the rest (1/4). Mom ate ((())/(())) of the watermelon.
一个西瓜，爸爸和小明各吃了它的(1/4)，妈妈吃了剩下的(1/4)，妈妈吃的占这个西瓜的((())/(()))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/4)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>