A plate of fruit, I ate (1/2) of it in the morning and the rest (1/2) in the afternoon, how much is left? how much is left
一盘水果，上午吃了它的(1/2)，下午吃了它剩下的(1/2)，最后还剩多少？还剩多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>