(理)已知tanα=2,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738005_ST/0.png)
=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738005_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738005_ST/4.png)
考点分析:
相关试题推荐
某产品的广告费用x与销售额y的统计数据如下表
广告费用x(万元) | 4 | 2 | 3 | 5 |
销售额y(万元) | 49 | 26 | 39 | 54 |
根据上表可得回归方程
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738004_ST/0.png)
中的
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738004_ST/1.png)
为9.4,据此模型预报广告费用为6万元时销售额为( )
A.63.6万元
B.65.5万元
C.67.7万元
D.72.0万元
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已知平面向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/1.png)
满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/2.png)
•(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/3.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/4.png)
)=3,且|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/5.png)
|=2,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/6.png)
|=1,则向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/8.png)
的夹角为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/9.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/10.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738003_ST/11.png)
D.
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已知命题p、q,“非p为假命题”是“p或q是真命题”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充要条件
D.既不充分也不必要条件
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若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124130699573870/SYS201310251241306995738001_ST/0.png)
=b+2i,其中a,b∈R,i是虚数单位,则a-b的值为( )
A.-1
B.-3
C.3
D.1
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已知全集U={1,2,3,4,5,6},集合A={1,2,5},∁
UB={4,5,6},则集合A∩B=( )
A.{1,2}
B.{5}
C.{1,2,3}
D.{3,4,6}
查看答案