1101101.10101（B）=109.65625(D)=1*2^6 + 1*2^5+0*2^4+1*2^3+1*2^2+0*2^1+1*2^0+1*2^(-1)+0*2^(-2)+1*2^(-3)+0*2^(-4)+1*2^(-5)=109.65625
