为什么二进制转化为十进制比如11就是2?＋2?结果就是一个十进制数字，为什么不是八进制数字？

当然也可以是八进制。因为

(11)2 = (2? + 2?)10 = (3)10

(11)2 = (2? + 2?)8 = (3)8

(101)2 = (2? + 2?)10 = (5)10

(101)2 = (2? + 2?)8 = (5)8

(1011)2 = (2?+2?+2?)10=(8+2+1)10=(11)10

(1011)2 = (2?+2?+2?)8 = (10+2+1)8=(13)8