100*100-99*99+98*98-97*97+96*96-95*95+...+2*2-1*1=how much.
100*100-99*99+98*98-97*97+96*96-95*95+…+2*2-1*1=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">(1/2) * 100 * 101</gadget>
<output>5_050</output>

<result>5_050</result>