(2/5)-(1/3)+(1/2)=how much.
(2/5)-(1/3)+(1/2)=多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(1/15) + (1/2)</gadget>
<output>17/30 = around 0.566667</output>

<result>17/30 = around 0.566667</result>