因为-B=(Acup B)-B,所以-B=(Acup B)-B.

A，B为两事件，若(Acup B)=0.8，(Acup B)=0.8，则（）成立.A.(Acup B)=0.8B.(Acup B)=0.8C.(Acup B)=

设A、B、C是任意三个随机事件，则下列命题正确的是( )(Acup B)-B=A-B(Acup B)-B=A-B(Acup B)-B=A-B(Acup B

设A,B为随机事件，则(Acup B)^c=B.（）A. 对B. 错

(1)设事件A与B相容,则有 ()-|||-(A) (Acup B)=P(A)+P(B);-|||-(B) (Acup B)=P(A)+P(B)-P(AB);-

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

A，B，C是任意事件，在下列各式中，不成立的是（）(A) (A-B)cup B=Acup B.-|||-(B) (Acup B)-A=B.-|||-(C) (A

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

2.设(A)=0.5, (B)=0.7, (Acup B)=0.9.试计算(A)=0.5, (B)=0.7, (Acup B)=0.9..2.设试计算.

(Acup B)P(AB)leqslant P(A)P(B) B (AB)geqslant P(A)P(B)(Acup B)P(AB)leqslant P(A)

5.化简:-|||-(1)(AB∪C)(AC);-|||-(2) (Acup B)(Acup overline (B)).