将自己父母的手机号与亲戚、朋友的手机号都写在纸上并进行比较,你能发现什么?事实上,经过反复比较,你能得出的比较确定的结论是:这些手机号都是这11位的.为什么我们所使用的手机号都是11位的呢?我们所使用的手机号是11位的(如图1),这11位数字可以分为三部分:前3位数字是网络识别号,第4~7位数字是地区编码,第8~11位数字是用户号码.这样的配置既能最大程度地利用号码资源,不至于浪费,又能在 In fact, after repeated comparison, you can draw a more conclusive conclusion is that these phone numbers are The eleven. Why do we use the phone number is 11? We use the phone number is 11 (Figure 1), the 11 digits can be divided into three parts: the first three digits is Network identification number, the first 4 to 7 digits is the area code, the first 8 to 11 digits is the user number.This configuration can maximize the use of number resources, not to waste, but also in