设 A，B，C 为三个事件，指出下列各等式成立的条件.(1) ABC = A(2) A cup B cup C = A(3) A cup B = AB(4) A cup B - A = 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 (

用作图法说明下列各命题成立:(1)cup B=(A-AB)cup B，且右边两事件互斥;(2)cup B=(A-AB)cup B,且右边三事件两两互斥。用作图法

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:-||

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

设A，B，C为三个事件，且(overline (A)cup overline (B))=0.9-|||-__ __，(overline (A)cup overl

5.单远题-|||-下列等式不成立的是 ()-|||-(A) cup B=(Aoverline (B))cup B-|||-(B) -B=Aoverline (

事件A与事件B相互独立，且cup B=cup B=，则cup B=0未知251事件A与事件B相互独立，且，则0未知251

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

1.设A,B为两个随机事件,则下列事件中,不是"A,B恰好发生一个"的是 () .-|||-(A) cup B (B) (A-B)cup (B-A)-|||-(

设 P(A)=0.3, P(B)=P(C)=0.2，且事件 A, B, C 两两互不相容，则 P(overline(A cup B cup C))= ( ).A