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在△ABC中,A(x,y),B(-2,0),C(2,0),给出△ABC满足的条件...
在△ABC中,A(x,y),B(-2,0),C(2,0),给出△ABC满足的条件,就能得到动点A的轨迹方程,下表给出了一些条件及方程:
条件 | 方程 |
①△ABC周长为10; ②△ABC面积为10; ③△ABC中,∠A=90° | E1:y2=25; E2:x2+y2=4(y≠0); E3:![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102807464981722/SYS201311031028074649817010_ST/0.png) |
则满足条件①、②、③的轨迹方程分别用代号表示为( )
A.E
3,E
1,E
2B.E
1,E
2,E
3C.E
3,E
2,E
1D.E
1,E
3,E
2
考点分析:
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