8.4/5*(5*2)=how much.
8.4/5*(5*2)=多少．
<gadget id="calculator">8.4 / 5</gadget>
<output>1.68</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">1.68 * 10</gadget>
<output>16.8</output>

<result>16.8</result>