(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89x(0.23十0.45)

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(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89x(0.23十0.45)
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(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89x(0.23十0.45)
(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89
x(0.23十0.45)

(1十0.23十0.45)x(0.45十o.67十0.89)一(1十0.45十0.67十0.89x(0.23十0.45)
设:a=0.45+0.67+0.89
b=0.23+0.45
当a=0.45+0.67+0.89 ,b=0.23+0.45时
原式=(1+b)a-(1+a)b
=a+ab-(b+ab)
=a+ab-b-ab
=a-b
a-b=0.45+0.67+0.89-(0.23+0.45)=1.33
∴原式=1.33
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