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已知△ABC的周长为20,且顶点B (0,-4),C (0,4),则顶点A的轨迹...
已知△ABC的周长为20,且顶点B (0,-4),C (0,4),则顶点A的轨迹方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743626075/SYS201311031027297436260003_ST/0.png)
(x≠0)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743626075/SYS201311031027297436260003_ST/1.png)
(x≠0)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743626075/SYS201311031027297436260003_ST/2.png)
(x≠0)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743626075/SYS201311031027297436260003_ST/3.png)
(x≠0)
考点分析:
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