解不等式组
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考点分析:
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已知:如图,点P是正方形ABCD的对角线AC上的一个动点(A、C除外),作PE⊥AB于点E,作PF⊥BC于点F,设正方形ABCD的边长为x,矩形PEBF的周长为y,在下列图象中,大致表示y与x之间的函数关系的是( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050015_ST/images1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050015_ST/images3.png)
D.
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如图,△ABC中,D、E分别为AC、BC边上的点,AB∥DE,CF为AB边上的中线,若AD=5,CD=3,DE=4,则BF的长为( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050014_ST/0.png)
B.
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C.
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D.
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已知一次函数y=
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x+m和y=-
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x+n的图象都经过点A(-2,0),且与y轴分别交于B,C两点,那么△ABC的面积是( )
A.2
B.3
C.4
D.6
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在Rt△ABC中,∠C=90°,若AC=2BC,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050012_ST/0.png)
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050012_ST/1.png)
D.
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化简
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185413140605063/SYS201311011854131406050011_ST/0.png)
的结果为( )
A.x+y
B.x-y
C.
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D.y-
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