Find the sum of 297+294+291+...+9+6+3.
求297+294+291+…+9+6+3的和．
<gadget id="calculator">3 + 297</gadget>
<output>300</output>

<gadget id="calculator">99 / 2</gadget>
<output>99/2 = around 49.5</output>

<gadget id="calculator">300 * (99/2)</gadget>
<output>14_850</output>

<result>14_850</result>