The two outer terms are 1.6 and 1.8, and the two inner terms are 3.6 and x.
两个外项是1.6和1.8，两个内项是3.6和x．
<gadget id="calculator">1.6 * 1.8</gadget>
<output>2.88</output>

<gadget id="calculator">2.88 / 3.6</gadget>
<output>0.8</output>

<result>0.8</result>