计算1+(-2)+3+(-4)+5+(-6)+····+(+2013)+(-2014)

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计算1+(-2)+3+(-4)+5+(-6)+····+(+2013)+(-2014)

1+(-2)+3+(-4)+5+(-6)+····+(+2013)+(-2014)
=[1+(-2)]+[3+(-4)]+[5+(-6)]+····+[(+2013)+(-2014)]
=-2014/2
=-1007