问题描述: 计算:(1+0.23+0.34)*(0.2903+0.34+0.56)-(1+0.23+0.34+0.56)*(0.23+0.34 1个回答 分类:数学 2014-09-26 问题解答: 我来补答 令0.23+0.34+0.56=a则1+0.23+0.34=1+a-0.560.23+0.34+0.56=a1+0.23+0.34+0.56=1+a0.23+0.34=a-0.56所以原式=a(1+a-0.56)-(1+a)(a-0.56)=a*1+a(a-0.56)-1*(a-0.56)-a(a-0.56)=a-(a-0.56)=a-a+0.56=0.56 展开全文阅读