(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+0.89b=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-ba-b=0.45+0.67+0.89-(0.23+0.45)=1.33∴原式=1.33师范附小李为您解答~如果您满意请按下采纳,您的采...