Calculation: 2011*2009-1011*1009+11*9=how much.
计算：2011*2009-1011*1009+11*9=多少．
<gadget id="calculator">2_011 * 2_009</gadget>
<output>4_040_099</output>

<gadget id="calculator">1_011 * 1_009</gadget>
<output>1_020_099</output>

<gadget id="calculator">4_040_099 - 1_020_099</gadget>
<output>3_020_000</output>

<gadget id="calculator">11 * 9</gadget>
<output>99</output>

<gadget id="calculator">3_020_000 + 99</gadget>
<output>3_020_099</output>

<result>3_020_099</result>