1+(-3)+(-5)+7+9+(-11)+(-13)+15+···+2009+(-2011)+(-2013)+2015
=【1+(-3)+(-5)+7】+【9+(-11)+(-13)+15】+···+【2009+(-2011)+(-2013)+2015】
=0+0+……+0
=0
1+(-3)+(-5)+7+9+(-11)+(-13)+15+···+2009+(-2011)+(-2013)+2015 =
1+(-3)+(-5)+7+9+(-11)+(-13)+15+···+2009+(-2011)+(-2013)+2015 =
数学人气:896 ℃时间:2020-01-09 15:05:33
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