LAB 27

Pa=0.15+0.85(1/2Pc)---1
Pb=0.15+0.85Pa---2
Pc=0.15+0.85(Pa+Pb)---3

1代2
Pb=0.15+0.1275+0.36125Pc---4

1.4代3

Pc=0.15+0.85(0.15+0.425Pc)+0.850.15+0.1275+0.36125Pc
    =0.513375+0.6683125Pc

0.3316875Pc=0.513375 =>Pc=1.5477671

Pb=0.15+0.1275+0.36125*1.5477671=0.83663086

Pa=0.15+0.425*0.15477671=0.807801012


Pc>Pb>Pa