128=2^8,对应二进制数为:100000000B0.26*2=0.52(取0)0.52*2=1.04(取1)0.04*2=0.08(取0)0.08*2=0.16(取0)0.16*2=0.32(取0)0.32*2=0.64(取0)0.64*2=1.28(取1)0.28*2=0.56(取0)......所以,0.26=0.01000010+ε(其中ε<2^(-8))128.26=100000000.0.01000010B+ε(其中ε<2^(-8))