7.2×14.5+17×2.8这道题怎么简便计算?
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:2024/08/01 12:19:42
7.2×14.5+17×2.8这道题怎么简便计算?
![7.2×14.5+17×2.8这道题怎么简便计算?](/uploads/image/z/6288146-26-6.jpg?t=7.2%C3%9714.5%2B17%C3%972.8%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%3F)
7.2×14.5+17×2.8
=(10-2.8)×14.5+17×2.8
=145+(17-14.5)×2.8
=145+10/4×2.8
=145+7
=152
=(10-2.8)×14.5+17×2.8
=145+(17-14.5)×2.8
=145+10/4×2.8
=145+7
=152