Calculate how much 2*4+4*6+6*8+...+98*100=.
计算2*4+4*6+6*8+…+98*100=多少．
<gadget id="calculator">99 / 6</gadget>
<output>33/2 = around 16.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(33/2) + (1/2)</gadget>
<output>17</output>

<gadget id="calculator">4 * 49 * 50 * 17</gadget>
<output>166_600</output>

<result>166_600</result>