Calculation: ((2009/2010)+(2010/2011)+(6/7))((1/2)+(2009/2010)+(2010/2011)+(2/5))-((1 /2)+(2009/2010)+(2010/2011)+(6/7))((2009/2010)+(2010/2011)+(2/5)).
计算：((2009/2010)+(2010/2011)+(6/7))((1/2)+(2009/2010)+(2010/2011)+(2/5))-((1/2)+(2009/2010)+(2010/2011)+(6/7))((2009/2010)+(2010/2011)+(2/5))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2_009 / 2_010</gadget>
<output>2_009/2_010 = around 0.999502</output>

<gadget id="calculator">2_010 / 2_011</gadget>
<output>2_010/2_011 = around 0.999503</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(2_009/2_010) + (2_010/2_011) + (6/7)</gadget>
<output>80_814_053/28_294_770 = around 2.856148</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2_009/2_010) + (2_010/2_011) + (2/5)</gadget>
<output>9_697_043/4_042_110 = around 2.399005</output>

<gadget id="calculator">(80_814_053/28_294_770) - (9_697_043/4_042_110)</gadget>
<output>16/35 = around 0.457143</output>

<gadget id="calculator">(1/2) * (16/35)</gadget>
<output>8/35 = around 0.228571</output>

<result>8/35 = around 0.228571</result>