化简:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629851934884/SYS201311030006298519348006_ST/0.png)
=
.
考点分析:
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如图,已知四边形ABCD中,R,P分别是BC,CD上的点,E,F分别是AP,RP的中点,当点P在CD上从C向D移动而点R不动时,那么下列结论成立的是( )
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A.线段EF的长逐渐增大
B.线段EF的长逐渐减少
C.线段EF的长不变
D.线段EF的长与点P的位置有关
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选择:在Rt△ABC中,∠C=90°,tanA=
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A.6
B.5
C.4
D.2
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同时抛掷两枚均匀的硬币,则两枚硬币国徽都朝上的概率是( )
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D.1
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关于x的一元二次方程2x
2-3x-a
2+1=0的一个根为2,则a的值是( )
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C.-
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D.±
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若线段c满足
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629851934884/SYS201311030006298519348001_ST/0.png)
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D.9cm
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