Question

计算1+(-2)+3+(-4)+5…+2013+(-2014)

Answer 1

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

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

=-2014/2

=-1007