(+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=
(+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