7.2×14.5+17×2.8 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:2024/08/04 05:56:46
7.2×14.5+17×2.8 简便计算
![7.2×14.5+17×2.8 简便计算](/uploads/image/z/3969031-31-1.jpg?t=7.2%C3%9714.5%2B17%C3%972.8+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
7.2×14.5+17×2.8
=7.2×14.5+14.5×2.8 +2.5×2.8
=14.5×10+2.5×4×0.7
=145+10×0.7
=152
=7.2×14.5+14.5×2.8 +2.5×2.8
=14.5×10+2.5×4×0.7
=145+10×0.7
=152