计算:0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99的答案,要简便运算
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:2024/06/22 15:58:43
计算:0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99的答案,要简便运算
![计算:0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99的答案,要简便运算](/uploads/image/z/4987387-19-7.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A0.1%2B0.2%2B0.3%2B0.4%2B0.5%2B0.6.0.97%2B0.98%2B0.99%E7%9A%84%E7%AD%94%E6%A1%88%2C%E8%A6%81%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99
=(0.1+0.2+...+0.9)+(0.10+0.11+...+0.99)
=(0.1+0.9)×9÷2+(0.10+0.99)×90÷2
=4.5+49.05
=53.55
=(0.1+0.2+...+0.9)+(0.10+0.11+...+0.99)
=(0.1+0.9)×9÷2+(0.10+0.99)×90÷2
=4.5+49.05
=53.55