-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584010_ST/0.png)
的倒数是
.
考点分析:
相关试题推荐
如图,在Rt△ABC中,∠ACB=90°,CD⊥AB,垂足为D.若AC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584009_ST/0.png)
,BC=2,则sin∠ACD的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584009_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584009_ST/3.png)
D.
查看答案
抛物线y=x
2-2x+1的顶点坐标是( )
A.(1,0)
B.(-1,0)
C.(-2,1)
D.(2,-1)
查看答案
实数a在数轴上的位置如图所示,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584007_ST/0.png)
化简后为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584007_ST/images1.png)
A.7
B.-7
C.2a-15
D.无法确定
查看答案
如图,DE是△ABC的中位线,若BC的长为3cm,则DE的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584006_ST/images0.png)
A.2cm
B.1.5cm
C.1.2cm
D.1cm
查看答案
在一个不透明的口袋中,装有5个红球3个白球,它们除颜色外都相同,从中任意摸出一个球,摸到红球的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190858292658425/SYS201311011908582926584005_ST/2.png)
D.
查看答案