x-(1/3)=(3/5), x=how much.
x-(1/3)=(3/5)，x=多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/5) + (1/3)</gadget>
<output>14/15 = around 0.933333</output>

<result>14/15 = around 0.933333</result>