1/2+(-2/3)+4/5+(-1/2)+(-1/3) (-5.9)-(-6.1) 28-(-74) (-3.8)-(+7)

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1/2+(-2/3)+4/5+(-1/2)+(-1/3)(-5.9)-(-6.1)28-(-74)(-3.8)-(+7)1/2+(-2/3)+4/5+(-1/2)+(-1/3)(-5.9)-(-6.1

1/2+(-2/3)+4/5+(-1/2)+(-1/3) (-5.9)-(-6.1) 28-(-74) (-3.8)-(+7)
1/2+(-2/3)+4/5+(-1/2)+(-1/3) (-5.9)-(-6.1) 28-(-74) (-3.8)-(+7)

1/2+(-2/3)+4/5+(-1/2)+(-1/3) (-5.9)-(-6.1) 28-(-74) (-3.8)-(+7)
1/2+(-2/3)+4/5+(-1/2)+(-1/3)=-1/5
(-5.9)-(-6.1)=0.2
28-(-74)=102
(-3.8)-(+7)=-10.8

-1/30；0。2；102；-10。8

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