1×2的五次方+0×2的四次方+1×2的三次方+0×2的二次方+1×2+1×2的零次方=32+8+2+1=43
101011b=1*2^5 0*2^4 1*2^3 0*2^2 1*2^1 1*2^0=32 8 2 1=43
1010112^0 2^1 2^3 2^5=1 2 8 32=43
101011(2)=1*2^5 0 1*2^3 0 1*2^1 1=43