Simple operation: 3.85*99; 2.9*101; 1.3*18+1.3*8+1.3*4.
简便运算：3.85*99；2.9*101；1.3*18+1.3*8+1.3*4．
<gadget id="calculator">1.3 * 18</gadget>
<output>23.4</output>

<gadget id="calculator">1.3 * 8</gadget>
<output>10.4</output>

<gadget id="calculator">1.3 * 4</gadget>
<output>5.2</output>

<gadget id="calculator">23.4 + 10.4 + 5.2</gadget>
<output>39</output>

<result>39</result>