已知:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498018_ST/0.png)
≠0,求
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498018_ST/1.png)
的值.
考点分析:
相关试题推荐
在下列命题中,真命题是( )
A.两个钝角三角形一定相似
B.两个等腰三角形一定相似
C.两个直角三角形一定相似
D.两个等边三角形一定相似
查看答案
在Rt△ABC中,∠ACB=90°,CD⊥AB,则下列等式一定不成立的是( )
A.AC
2=AD•AB
B.BC
2=BD•AB
C.AB
2=AC•BC
D.CD
2=AD•BD
查看答案
如图,在△ABC中,下列所给的四个条件,其中不一定能得到DE∥AC的条件是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498015_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498015_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498015_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498015_ST/2.png)
D.
查看答案
已知线段a,b,c,求作线段x,使
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498014_ST/0.png)
,下列作法中正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498014_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498014_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498014_ST/images3.png)
D.
查看答案
如图,梯形ABCD中,BC∥AD,BC=3AD,点E在AB边上,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722061249850/SYS201311030007220612498013_ST/0.png)
,则△BEC的面积与四边形AECD的面积之比为
.
查看答案