巧算7.2*61.3+73.8*2.8快

来源:学生学帮网 编辑:学帮网 时间:2024/06/03 00:02:09

巧算7.2*61.3+73.8*2.8

7.2*61.3+73.8*2.8
=7.2*73.8+73.8*2.8-12.5*7.2
=738-12.5*4*1.8
=738-90
=648