(500-180)/(17+23)=how much.
(500-180)/(17+23)=多少．
<gadget id="calculator">500 - 180</gadget>
<output>320</output>

<gadget id="calculator">17 + 23</gadget>
<output>40</output>

<gadget id="calculator">320 / 40</gadget>
<output>8</output>

<result>8</result>