随机事件 A,B 满足 (A)=P(B)=dfrac (1)(2), 且 (Acup B)=1, 则 (overline (A)cup overline (B))= __ .

(5)设 (A)=dfrac (1)(3), (B)=dfrac (1)(4), (Acup B)=dfrac (1)(2), 则 (overline (A)c

二、化简下列各式-|||-1、 (Acup B)(overline (A)cup B)(Acup overline (B))

设A，B，C为三个事件，且P(overline(A)cup overline(B))=0.9，P(overline(A)cup overline(B)cup o

(1)(overline(AB)cup C)(overline(AC)); (2)(Acup B)(Acupoverline(B)).6.证明:(Acup B

设随机事件A,B相互独立, P(A)=0.2 ,P(B)=0.5 ,则 (overline (A)cup overline (B))=() .

5.设A,B,C为三个随机事件,且 (overline (A)cup overline (B))=0.8 (overline (A)cup overline (

设事件A，B相互独立，且P（overline(A)∩overline(B)）=(1)/(9)，P（Aoverline(B)）=P（overline(A)B），则

1.已知事件A,B,C,则以下结论错误的是 () .-|||-(a) overline (AB)=overline (A)cup overline (B) (b

已知(overline (Acup B))=0.2 P(B)=0.5，问（1），P(A-B)= ;(2)(overline (Acup B))=0.2

3.指出下列等式和命题是否成立,并说明理由:-|||-(1) cup B=(AB)cup B;-|||-(2) overline (A)B=Acup B:-||