15-[1-(-20-4)] (-40)-28-(-19)+(-24)22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程

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15-[1-(-20-4)] (-40)-28-(-19)+(-24)22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程

15-[1-(-20-4)] (-40)-28-(-19)+(-24)22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程
15-[1-(-20-4)] (-40)-28-(-19)+(-24)
22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程

15-[1-(-20-4)] (-40)-28-(-19)+(-24)22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程

15-[1-(-20-4)] =15-[1-(-24)]=15-[1+24]=15-25=-10
(-40)-28-(-19)+(-24)=-40-28+19-24=-68-24+19=-92+19=-73
22.54+(-4.4)+(-12.54)+4.4=22.54-12.54=10
(2/3-1/2)-(1/3-5/6)=2/3-1/2-1/3+5/6=2/3-5/6+5/6=2/3