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在正项等比数列{an}中,公比q=2,且,则a3-a5等于( ) A.4 B.-...
在正项等比数列{a
n}中,公比q=2,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346007383/SYS201311031027473460073005_ST/0.png)
,则a
3-a
5等于( )
A.4
B.-4
C.
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D.±4
考点分析:
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由曲线y=x
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B.
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D.
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sinα≠sinβ是α≠β的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
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下列选项中,说法正确的是( )
A.命题“若am
2<bm
2,则a<b”的逆命题是真命题
B.设
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是向量,命题“若
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,则|
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|=|
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|”的否命题是真命题
C.命题“p∪q”为真命题,则命题p和q均为真命题
D.命题∃x∈R,x
2-x>0”的否定是“∀x∈R,x
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已知集合M={m,-3},N={x|2x
2+7x+3<0,x∈Z},如果M∩N≠∅,则m等于( )
A.-1
B.-2
C.-2或-1
D.
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