(+1)+(-2)+(+3)+(-4)+…+(+2005)+(-2006)+2007怎么做?
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(+1)+(-2)+(+3)+(-4)+…+(+2005)+(-2006)+2007怎么做?
(+1)+(-2)+(+3)+(-4)+…+(+2005)+(-2006)+2007怎么做?
(+1)+(-2)+(+3)+(-4)+…+(+2005)+(-2006)+2007怎么做?
配对的方法,每2个数的和为-1.之前一共1003组所以是-1003+2007=1004