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)=
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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)=
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)=
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)=
(-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
1、(-7)+(+11)+3+(-2)
=11+3-7-2
=5
2.(-1/2)+(-2/3)+(-5/6)
=-3/6-4/6-5/6
=-2
3.1/4+(-2/3)+(+5/6)+(-1/4)+(-1/3)
=1/4-1/4-2/3-1/3+5/6
=0-1+5/6
=1又5/6
1、=-7+11+3-2=5
2、=-1/2-2/3-5/6=-12/6=-2
3、=1/4-2/3+5/6-1/4-1/3=-1/6
(1):原式=-7+11+3-2=5
(2):原式=-1/2-2/3-5/6=-(1/2+2/3+5/6)=-2
(3):原式=1/4-2/3+5/6-1/4-1/3=(1/4-1/4)-(1/3+2/3)+5/6=-1/6