Question

(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

Answer 1

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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