来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/19 04:53:01
怎样简便运算,
(3又3/11*25.8-3又3/11*16.76+18/55*19.6)*(1.25-7/12+5/36)
=[3又3/11*(25.8-16.76)+18/55*(20-0.4)]*(1.25-4/9)
=[36/11*9.04+72/11-7.2/55]*29/36
=29/11*9.04+58/11-0.2*29/55
=29*(9.04/11+2/11-0.2/55)
=29*(9.04/11-0.04/11+2/11)
=29*11/11
=29 .