90*4+70*3.
90*4+70*3．
<gadget id="calculator">90 * 4</gadget>
<output>360</output>

<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">360 + 210</gadget>
<output>570</output>

<result>570</result>