满分5 >
初中数学试题 >
在△ABC中,∠ACB=90°,CD⊥AB于D,若AD=1,tanA=2,则BD...
在△ABC中,∠ACB=90°,CD⊥AB于D,若AD=1,tanA=2,则BD的长等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597008_ST/0.png)
B.3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597008_ST/1.png)
D.4
考点分析:
相关试题推荐
同圆的内接正三角形、正方形、正六边形边长的比是( )
A.1:2:3
B.1:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597007_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597007_ST/1.png)
D.3:4:6
查看答案
已知二次函数y=ax
2+bx+c(a≠0)的图象如图所示,则直线y=ax+b与反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597006_ST/0.png)
在同一坐标系内的大致图象为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597006_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597006_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597006_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597006_ST/images4.png)
D.
查看答案
如图PA、PB分别切⊙O于点A、B,∠P=70°,点C是⊙O上的一点,则∠C的度数等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597005_ST/images0.png)
A.140°
B.110°
C.70°
D.55°
查看答案
如图是由几个相同的小正方体搭成的一个几何体,它的左视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161307525959719/SYS201310221613075259597004_ST/images3.png)
D.
查看答案
两圆的圆心距为3,两圆的半径分别是方程x
2-4x+3=0的两个根,则两圆的位置关系是( )
A.相交
B.外离
C.内含
D.外切
查看答案