A piece of chocolate, Xiaodong ate (2/8), Xiaohong ate (3/8), ate ((())/(())) in total, and left ((())/(()) )).
一块巧克力，小东吃了(2/8)，小红吃了(3/8)，一共吃了((())/(()))，还剩下((())/(()))．
<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/4) + (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>