(-5)+(-2)+(+9)-(-8) -15+(+3)-(-15)+(+2)+(-8)0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)2-【(-5又3分之2)-(-3分之1)】

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(-5)+(-2)+(+9)-(-8)-15+(+3)-(-15)+(+2)+(-8)0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)2-【(-5又3分之2)-(-3分之1)】(

(-5)+(-2)+(+9)-(-8) -15+(+3)-(-15)+(+2)+(-8)0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)2-【(-5又3分之2)-(-3分之1)】
(-5)+(-2)+(+9)-(-8) -15+(+3)-(-15)+(+2)+(-8)
0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)
2-【(-5又3分之2)-(-3分之1)】

(-5)+(-2)+(+9)-(-8) -15+(+3)-(-15)+(+2)+(-8)0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)2-【(-5又3分之2)-(-3分之1)】
(-5)+(-2)+(+9)-(-8)
=-7+9+8
= 2+8
=10
-15+(+3)-(-15)+(+2)+(-8)
=-12+15+2-8
=5-8
=-3
0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)
=(0.85-1.85)+(0.75-2.75)+3
=-1-2+3
=0
2-【(-5又3分之2)-(-3分之1)】
=2-5又1/3
=-3又1/3

(-5)+(-2)+(+9)-(-8)=-5-2+9+8=10
-15+(+3)-(-15)+(+2)+(-8)=-15+15+3+2-8=-3
0.85+(+0.75)-【+2又4分之3】+(-1.85)+(+3)=0.85-1.85+0.75-2又4分之3+3=0
2-【(-5又3分之2)-(-3分之1)】=2-(-5又3分之2+3分之1)=2+5又3分之1=7又3分之1

口算一下,从左到右,10 ,-3 ,0 ,22/3

第一题:-7 17-12 15-6=10 3-6=7
第二题:1.60-2.75-1.85 3=4.60-4.60=0
第三题:2-16/3=-10/3

1.原式=-7+9+8=10
2.原式=-13+15+2-8=-4
3.原式=0.85+0.75-2.75-1.85+3=0
4.原式=-(-5-2/3+1/3)=51/3

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