1.（-7）+（+11）+3+（-2)= 2.(-1/2)+(-2/3)+(-5/6)= 3.1/4+(-2/3)+(+5/6)+(-1/4)+(-1/3)=
（-7）+（+11）+3+（-2)=
(-1/2)+(-2/3)+(-5/6)=
1/4+(-2/3)+(+5/6)+(-1/4)+(-1/3)=
人气：392 ℃ 时间：2020-06-04 21:01:44
解答
（-7）+（+11）+3+（-2)= 11+3-2-7=5
(-1/2)+(-2/3)+(-5/6)=-(3/6+4/6+5/6)-12/6=-2
1/4+(-2/3)+(+5/6)+(-1/4)+(-1/3)=(1/4-1/4)-(1/3+2/3)+5/6=5/6-1=-1/6
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