设A,B是随机事件,P（A）=0.7,P（A-B=0.3,则P(AB)=
人气：213 ℃ 时间：2019-11-15 19:25:40
解答
P(AB) = P(A) - P(A-B) = 0.7 - 0.3 = 0.4
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