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一元二次方程的根( ) A., B.x1=2,x2=-2 C. D.
一元二次方程
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的根( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818764617210/SYS201310221648187646172003_ST/1.png)
,
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B.x
1=2,x
2=-2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818764617210/SYS201310221648187646172003_ST/3.png)
D.
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B.
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C.
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D.
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-2的绝对值等于( )
A.-
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B.
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C.-2
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已知:在△ABC中AB=AC,点D为BC边的中点,点F是AB边上一点,点E在线段DF的延长线上,∠BAE=∠BDF,点M在线段DF上,
∠ABE=∠DBM.
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812471860430/SYS201310221648124718604025_ST/0.png)
MD;
(2)如图2,当∠ABC=60°时,则线段AE、MD之间的数量关系为______;
(3)在(2)的条件下延长BM到P,使MP=BM,连接CP,若AB=7,AE=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812471860430/SYS201310221648124718604025_ST/1.png)
,求tan∠PCB和tan∠ACP的值.
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)=0.
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