What can be simple should be simple: 3.5*72+6.5*28.
能简便的要简便：3.5*72+6.5*28．
<gadget id="calculator">3.5 * 72</gadget>
<output>252</output>

<gadget id="calculator">6.5 * 28</gadget>
<output>182</output>

<gadget id="calculator">252 + 182</gadget>
<output>434</output>

<result>434</result>