9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/19 02:44:15
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?9+99+999+9999+99999+9999
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
9+99+999+9999+99999+999999+9999999+99999999+999999999+9999999999等于多少,有简便方法吗?
在每项上加1,就是简便算法,总共加10个1,最后再减去10,就好了