=(+1)+(-3)+(+2)+(-4)+(+6)+(-8)+(+7)+(-9)...+(+97)+(-99)+(+98)+(-100)
=(-2)+(-2)+(-2)+(-2)+...+(-2)+(-2)+(-2)
=(-2)*(100/2)
=-2*50
=-100
(+1)+(+2)+(-3)+(-4)+(+6)+(+7)+(-8)...+(-9)+(+97)+(+98)+(-99)+(-100)
(+1)+(+2)+(-3)+(-4)+(+6)+(+7)+(-8)...+(-9)+(+97)+(+98)+(-99)+(-100)
数学人气:114 ℃时间:2020-04-06 19:08:05
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