把18.25.45.71.82从12进位转换为10进位.

十二进制的基本数为0-11
也就是0,1,2,3,4,5,6,7,8,9,A,B,C
(18)_12进制 = 1x12^1+8x12^0 = 20
(25)_12进制 = 2x12^1+5x12^0 = 29
(45)_12进制 = 4x12^1+5x12^0 = 53
(71)_12进制 = 7x12^1+1x12^0 = 85
(82)_12进制 = 8x12^1+2x12^0 = 98

其实就是十位数字乘12加上个位数字
（18）12=1*12+8=20
（25）12=2*12+5=29
53
85
98