138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7

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138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7
138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7

138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7
138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7
=137+1.25+23.3*1.25-1.25*38+1.25*28.7
=137+1.25*(1+23.3-38+28.7)
=137+1.25*15
=137+18.75
=155.75

138.25+23.3*(2-0.75)-1.25*38+1.25*28.7=155.75

138又4分之1+23.3*(2-4分之3)-1.25*38+(1+0.25)*28.7
=138.25+23.3*1.25-1.25*38+1.25*28.7
=138.25+1.25*(23.3-38+28.7)
=138.25+14
=152.25