将二进制1111.11转换成十进制。写出具体步骤

(1111)2 =((((0*2+1)*2+1)*2+1)*2+1)10 =(((1*2+1)*2+1)*2+1)10 =((3*2+1)*2+1)10 =(7*2+1)10 =(15)10 (0.11)2 =((1/2+1)/2)10 =((0.5+1)/2)10 =(1.5/2)10 =(0.75)10 (1111.11)2=(15.75)10