用简便方法计算:3.14*81-3.14+19*3.14
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:2024/07/31 20:14:34
用简便方法计算:3.14*81-3.14+19*3.14
![用简便方法计算:3.14*81-3.14+19*3.14](/uploads/image/z/2899704-48-4.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A3.14%2A81-3.14%2B19%2A3.14)
3.14*81-3.14+19*3.14
=3.14*(81-1+19)
=3.14*(100-1)
=3.14*100-3.14
=314-3.14
=310.86
=3.14*(81-1+19)
=3.14*(100-1)
=3.14*100-3.14
=314-3.14
=310.86