用简便方法计算:0.9+0.99+0.999+0.9999+0.99999
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:2024/06/30 00:23:54
用简便方法计算:0.9+0.99+0.999+0.9999+0.99999
![用简便方法计算:0.9+0.99+0.999+0.9999+0.99999](/uploads/image/z/805964-68-4.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%9A0.9%2B0.99%2B0.999%2B0.9999%2B0.99999)
0.9+0.99+0.999+0.9999+0.99999
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)+(1-0.00001)
=5-0.11111
=4.88889
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)+(1-0.00001)
=5-0.11111
=4.88889