满分5 >
高中数学试题 >
在平面直角坐标系中,不等式组(a为常数)表示的平面区域面积是9,那么实数a的值为...
在平面直角坐标系中,不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855007_ST/0.png)
(a为常数)表示的平面区域面积是9,那么实数a的值为( )
A.3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855007_ST/1.png)
+2
B.-3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855007_ST/2.png)
+2
C.-5
D.1
考点分析:
相关试题推荐
(文)若一条直线与平面所成的角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/0.png)
,则此直线与这个平面内任意一条直线所成角的取值范围是( )
A.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/2.png)
]
B.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/3.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/4.png)
]
C.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/5.png)
,π]
D.[0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855006_ST/6.png)
]
查看答案
一条直线与平面所成的角为θ (0<θ<
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855005_ST/0.png)
),则此直线与这个平面内任意一条直线所成角中最大角是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855005_ST/1.png)
B.π
C.π-θ
D.θ
查看答案
(文)若tanα=2,则tan(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855004_ST/0.png)
+α)的值为( )
A.3
B.-3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855004_ST/1.png)
D.-
查看答案
在△ABC中,∠C=90°,若AC=3,BC=4,则cos(A-B)的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842385543/SYS201310241834418423855003_ST/2.png)
D.
查看答案
在等差数列{a
n}中,a
1•a
3=8,a
2=3,则公差d=( )
A.1
B.-1
C.±1
D.±2
查看答案