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【单选题】
已知点A(-3,6),点B(7,-8),点C是AB中点,则点C的坐标是( )A.
（2，-1）
B.
（-2,1）
C.
（-1,2）
D.
（4，-2）
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举一反三
【简答题】设随机事件 A 与 B 互不相容且 P ( A ) = p , P(B)=q ,则 P ( A+B ) = _____________
【单选题】设随机事件 A 与 B 互不相容,且 P(A)>0 , P(B)>0 ,则
A.
P(A)=1-P （ B ）
B.
P(AB)=P(A)P(B)
C.
P(A ∪ B)=1
D.
P( )=1
【单选题】Read the following sentences carefully and choose the one in which the underlined word has the same meaning as in the sentence quoted from the passages in the book as well as the online course. (1) A ...
A.
If you give me a hand clearing the rubbish from my garden I’ll help you to paint your house—you scratch my back and I’ll scratch yours.
B.
We scratched the paintwork while trying to get the bed into Martha’s room.
C.
Be careful of the cat; it will scratch you!
【单选题】Houses in China are very expensive. According to Chinese law, which of the following is correct?
A.
You can use arable land to build houses and sell them
B.
Although there is no permission, as long as the house has been built, it can't be demolished
C.
You can't build a sky garden on your own roof without permission
D.
If your house is demolished by government without permission, you can be compensated accordingly
【单选题】设随机事件A与B互不相容,且P(A)>P(B)>0,则( )
A.
P(A)=1-P(B)
B.
P(AB)=P(A)P(B)
C.
P(A∪B)=1
D.
P( )=1
【简答题】设随机事件 A 与 B 互不相容且 P ( A ) = p , P(B)=q ,则 P (AB ) = _____________
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