(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)怎么算
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![(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)怎么算](/uploads/image/z/92543-23-3.jpg?t=%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B...%2B%28-99%29%2B%28%2B100%29%E6%80%8E%E4%B9%88%E7%AE%97)
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(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)怎么算
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)怎么算
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)怎么算
(-1)+(+2)+(-3)+(+4)+...+(-99)+(+100)=
(2+4+6...+100)-(1+3+5.+99)=
50*(2+100)/2-50*(1+99)/2=25*(2+100-100)=50