((2006*2007+2007*2008+2006*2008-2)/(1+2+3+...+2006+2007)).
((2006*2007+2007*2008+2006*2008-2)/(1+2+3+…+2006+2007))．
<gadget id="calculator">2_008 - 1</gadget>
<output>2_007</output>

<gadget id="calculator">2_006 * 2_007</gadget>
<output>4_026_042</output>

<gadget id="calculator">2_006 + 1</gadget>
<output>2_007</output>

<gadget id="calculator">2_007 * 2_008</gadget>
<output>4_030_056</output>

<gadget id="calculator">2_006 * 2_008</gadget>
<output>4_028_048</output>

<gadget id="calculator">4_028_048 - 2</gadget>
<output>4_028_046</output>

<gadget id="calculator">4_026_042 + 4_030_056 + 4_028_046</gadget>
<output>12_084_144</output>

<gadget id="calculator">1 + 2_007</gadget>
<output>2_008</output>

<gadget id="calculator">2_007 / 2</gadget>
<output>2_007/2 = around 1_003.5</output>

<gadget id="calculator">2_008 * (2_007/2)</gadget>
<output>2_015_028</output>

<gadget id="calculator">12_084_144 / 2_015_028</gadget>
<output>4_012/669 = around 5.99701</output>

<result>4_012/669 = around 5.99701</result>