1、 与二进制数（101110）等值的十进制数是?

46

不对吧？是46也~~~~
0*2^0+1*2^1+1*2^2+1*2^3+0*2^4+1*2^5=0+2+4+8+0+32=46

2^5+2^3+2^2+2
=32+8+4+2

0*2^0+1*2^1+1*2^2+1*2^3+0*2^4+1*2^5,这就是所谓的按权展开,应得46.

点会系8嘎,8系1000(2既立方),前面既人讲的好明啦~~

2+2^2+2^3+2^5=46