【简答题】已知点A(-1,0),B(1,0),动点P满足PA+PB=3,则动点P的轨迹是______.
【单选题】下列命题中是错误命题的个数有( ) ①A、B为两个事件,则P(A∪B)=P(A)+P(B); ②若事件A、B满足P(A)+P(B)=1,则A,B是对立事件; ③A、B为两个事件,p(A|B)=P(B|A); ④若A、B为相互独立事件,则 p( . A B)=P( . A )P(B) .
【单选题】Why don't you come and join us for disco?
A.
Because I will be busy.
D.
No, thank you all the same.
【判断题】若事件A,B,C满足AUC=BUC,则A与B相等。()
【简答题】阅读理解 Are you thinking about what to do in your free time? Come and join us ---Youth Club! Join in lessons and activities. It's fun! For more information, call 13812427108! Lessons Activities Monday~~ ...
【简答题】酸、碱指示剂的变色原理是什么? 影响酸碱指示剂变色范围的因素是什么?
【简答题】已知 , , (1)若 ,求事件A: 的概率; (2)求 满足条件: 的概率
【单选题】若P(A)>0,事件满足P(B|A)=1,则
【简答题】假设事件A和事件B满足P(B|A)=1,则______。 A.A是必然事件 B. C. D.假设事件A和事件B满足P(B|A)=1,则______。 A.A是必然事件