2.3*3.14+31.4*0.57+6.28．
2.3*3.14+31.4*0.57+6.28．
<gadget id="calculator">2.3 * 3.14</gadget>
<output>7.222</output>

<gadget id="calculator">31.4 * 0.57</gadget>
<output>17.898</output>

<gadget id="calculator">7.222 + 17.898 + 6.28</gadget>
<output>31.4</output>

<result>31.4</result>