3.5*84+85*6.55.
3.5*84+85*6.55．
<gadget id="calculator">3.5 * 84</gadget>
<output>294</output>

<gadget id="calculator">85 * 6.55</gadget>
<output>556.75</output>

<gadget id="calculator">294 + 556.75</gadget>
<output>850.75</output>

<result>850.75</result>