Find the sum of 2+4+6+...+196+198.
求2+4+6+…+196+198的和．
<gadget id="calculator">2 + 198</gadget>
<output>200</output>

<gadget id="calculator">198 / 2</gadget>
<output>99</output>

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

<gadget id="calculator">200 * (99/2)</gadget>
<output>9_900</output>

<result>9_900</result>