(1-2011 Times 2010-2010 times 2009)(2014+2011 times 2010+2010 times 2009)-(1-2014-2011 times 2010-2010 times 2009)(2011 times 2010+2010 times 2009)=
If (2011X2010+2010X2009) is regarded as X, the original expression is
(1-X)(2014+X)-(1-2014-X) X =2014+X-2014X-X squared -X+2014X-X squared =2014
Calculation 1+(-2)+3+(-4)+5+(-6)+...+2009+(-2010)+2011+(-2012) And 1+(-2)+(-3)+4+5+(-6)+(-7)+8+...+2009+(-2010)+9+(-2011)+2012
Two terms, two terms, and then see how many there are, and multiply it out
The next question is four items, four items, all of which are 0, and finally 0