满分5 >
高中数学试题 >
在△ABC中,若,C=120°,,则AB=( ) A.3 B.4 C.5 D.6...
在△ABC中,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709007_ST/0.png)
,C=120°,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709007_ST/1.png)
,则AB=( )
A.3
B.4
C.5
D.6
考点分析:
相关试题推荐
下列几何体各自的三视图中,有且仅有两个视图相同的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709006_ST/images0.png)
A.①②
B.①③
C.①④
D.②④
查看答案
证明1+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709005_ST/0.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709005_ST/1.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709005_ST/2.png)
+…+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709005_ST/3.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709005_ST/4.png)
(n∈N
*),假设n=k时成立,当n=k+1时,左端增加的项数是( )
A.1项
B.k-1项
C.k项
D.2
k项
查看答案
若函数f(x)=e
-xsinx,则此函数图象在点(4,f(4))处的切线的倾斜角为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709004_ST/0.png)
B.0
C.钝角
D.锐角
查看答案
如图,定圆半径为a,圆心坐标为(b,c),则直线ax+by+c=0,与直线x+y-1=0的交点在( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709003_ST/images0.png)
A.第一象限
B.第二象限
C.第三象限
D.第四象限
查看答案
若a>b>0,则下列不等式中总成立的是( )
A.a+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/0.png)
>b+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/2.png)
>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/3.png)
C.a+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/4.png)
>b+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/5.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211930586770930/SYS201310232119305867709002_ST/6.png)
>
查看答案