1*1-2*2+3*3-4*4+5*5-6*6+...-100*100+101*101.
1*1-2*2+3*3-4*4+5*5-6*6+…-100*100+101*101．
<gadget id="calculator">101 + 1</gadget>
<output>102</output>

<gadget id="calculator">101 / 2</gadget>
<output>101/2 = around 50.5</output>

<gadget id="calculator">102 * (101/2)</gadget>
<output>5_151</output>

<result>5_151</result>