设A,B是两个随机事件,且P(A)+P(B)=0.8,P(A+B)=0.6,则=_______.
考试:国家电网招聘
科目:其他工学类 (电网)(在线考试)
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设A,B是两个随机事件,且P(A)+P(B)=0.8,P(A+B)=0.6,则=_______.
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