(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=4分之三-2分之七+(-6分之一)-(-3分之二)-1=
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![(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=4分之三-2分之七+(-6分之一)-(-3分之二)-1=](/uploads/image/z/14201659-19-9.jpg?t=%28%2B1%29%2B%28-2%29%2B%28%2B3%29%2B%28-4%29%2B...%2B%28%2B99%29%2B%28-100%29%3D4%E5%88%86%E4%B9%8B%E4%B8%89-2%E5%88%86%E4%B9%8B%E4%B8%83%EF%BC%8B%28-6%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%89-%EF%BC%88-3%E5%88%86%E4%B9%8B%E4%BA%8C%EF%BC%89-1%3D)
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=4分之三-2分之七+(-6分之一)-(-3分之二)-1=
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=
4分之三-2分之七+(-6分之一)-(-3分之二)-1=
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=4分之三-2分之七+(-6分之一)-(-3分之二)-1=
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100)=(-1)x50=-50
4分之三-2分之七+(-6分之一)-(-3分之二)-1
=3/4-7/2-1/6+2/3-1
=9/12-42/12-2/12+8/12-12/12
=-39/12
=-13/4
-50;-4分之13