75.4-12.81-11.09-23.1=?的简便方法!
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/28 09:19:50
75.4-12.81-11.09-23.1=?的简便方法!
![75.4-12.81-11.09-23.1=?的简便方法!](/uploads/image/z/19086336-0-6.jpg?t=75.4-12.81-11.09-23.1%3D%3F%E7%9A%84%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%21)
原式=75.4-(12.81+11.09+23.1)
=75.4-(23.9+23.1)
=75.4-47
=28.4
411-299=411-300+1
=111+1
=112
=75.4-(23.9+23.1)
=75.4-47
=28.4
411-299=411-300+1
=111+1
=112