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)-B=A-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 (A)=0.5, (Acup B)=0.8, P(A-B)=0.2，则 (A)=0.5, (Acup B)=0.8, P(A-B)=0.2 的值为 A 0

[题目]已知 (A)=0.5, (B)=0.4, P(A-B)=0.3, 则-|||-(Acup B)= __

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

A Acup B=Omega B AB=emptyset C P(overline(A)cupoverline(B))=1 D P(A-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为随机事件，则(Acup B)^c=B.（）A. 对B. 错

7.试问下列命题是否成立?-|||-(1) -(B-C)=(A-B)-C;-|||-(2)若 =Q 且CCA,则 =varnothing ;-|||-(3) (

(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);-

7.设A,B,C为三个事件,求下列各题:-|||-(1)若 P(A)=0.4 ,P(B)=0.25 ,P(A-B)=0.25 ,求 P(B-A) .-|||-(