(-1-1)(1-2)(2-3)(3-4).(2010-2011)=

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(-1-1)(1-2)(2-3)(3-4).(2010-2011)=
(-1-1)(1-2)(2-3)(3-4).(2010-2011)=

(-1-1)(1-2)(2-3)(3-4).(2010-2011)=
-2

1+2+3+4+1 1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4