8.4/8/5*(8+8)*5=how much.
8.4/8/5*(8+8)*5=多少．
<gadget id="calculator">8.4 / 8 / 5</gadget>
<output>0.21</output>

<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<gadget id="calculator">0.21 * 16 * 5</gadget>
<output>16.8</output>

<result>16.8</result>