(1011)10
=((((0*1010+1)*1010+0)*1010+1)*1010+1)2
=(((1*1010+0)*1010+1)*1010+1)2
=(((1010+0)*1010+1)*1010+1)2
=((1010*1010+1)*1010+1)2
=((1100100+1)*1010+1)2
=(1100101*1010+1)2
=(1111110010+1)2
=(1111110011)2