②,设 lt P(C)lt 1, 且 (A+B|C)=P(A|C)+P(B|C), 则下列正确的是 ()-|||-(A) (A+B|overline (C))=P(A|overline (C))+P(B|overline (C))-|||-(B) P(AC+BC)=P(AC)+P(BC)-|||-(C) P(A+B)=P(A|C)+P(B|C)-|||-(D) (C)=P(A)P(C|A)+P(B)P(C|A|)