如图:已知在平行四边形ABCD中,E是AD上一点,CE与BD相交于点O,CE与BA的延长线相交于点G,已知DE=2AE,CE=10.
求GE、CO的长.
考点分析:
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/0.png)
、
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、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/2.png)
满足
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/3.png)
,试用向量
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/4.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/5.png)
表示向量
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/6.png)
,那么
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372014_ST/7.png)
=
.
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