Calculation: 33+32-31+30+29-28+...+3+2-1.
计算：33+32-31+30+29-28+…+3+2-1．
<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">36 * (11/2)</gadget>
<output>198</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 * 11</gadget>
<output>11</output>

<gadget id="calculator">198 + 11</gadget>
<output>209</output>

<result>209</result>