6.3*2.57+25.7*0.37.
6.3*2.57+25.7*0.37．
<gadget id="calculator">6.3 * 2.57</gadget>
<output>16.191</output>

<gadget id="calculator">25.7 * 0.37</gadget>
<output>9.509</output>

<gadget id="calculator">16.191 + 9.509</gadget>
<output>25.7</output>

<result>25.7</result>