已知: Rl:IF A1 THEN B1 CF(B1,A1)=0.8 R2:IF A2 THEN B1 CF(B1,A2)=0.5 R3:IF B1∧A3 THEN B2 CF(B2,B1∧A3)=0.8 設初始證據(jù)A1,A2,A3的可信度均為1,即CF(A1)=CF(A2)=CF(A3)=1,而對B1幾乎一無所知。求CF(B1)和CF(B2)。