问题标题：
(1+0.34+0.45)x(0.34+0.45+0.86)-(1+0.34+0.45+0.86)x(0.34+0.45)
问题描述：
(1+0.34+0.45)x(0.34+0.45+0.86)-(1+0.34+0.45+0.86)x(0.34+0.45)
曲伟回答：
(1+0.34+0.45)x(0.34+0.45+0.86)-(1+0.34+0.45+0.86)x(0.34+0.45)=(1+0.34+0.45)x(0.34+0.45)+(1+0.34+0.45)x0.86-[(1+0.34+0.45)x(0.34+0.45)+0.86x(0.34+0.45)]=(1+0.34+0.45)x(0.34+0.45)+0.86+(0.34+0.45)x0.86-(1+0.34+0.45)x(0.34+0.45)-0.86x(0.34+0.45)=0.86
满意请采纳
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