Calculation: 20112011*1949-19501950*2009=how much.
计算：20112011*1949-19501950*2009=多少．
<gadget id="calculator">20_112_011 * 1_949</gadget>
<output>39_198_309_439</output>

<gadget id="calculator">19_501_950 * 2_009</gadget>
<output>39_179_417_550</output>

<gadget id="calculator">39_198_309_439 - 39_179_417_550</gadget>
<output>18_891_889</output>

<result>18_891_889</result>