6.7*3.6-6.7*2.6．
6.7*3.6-6.7*2.6．
<gadget id="calculator">6.7 * 3.6</gadget>
<output>24.12</output>

<gadget id="calculator">6.7 * 2.6</gadget>
<output>17.42</output>

<gadget id="calculator">24.12 - 17.42</gadget>
<output>6.7</output>

<result>6.7</result>