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观察下列数据:,,,,,…它们是按一定规律排列的,依照此规律,第n个数据是 .
观察下列数据:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317013_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317013_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317013_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317013_ST/3.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317013_ST/4.png)
,…它们是按一定规律排列的,依照此规律,第n个数据是
.
考点分析:
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已知:如图,在△ABC中,AD⊥BC,垂足为点D,BE⊥AC,垂足为点E,M为AB边的中点,连结ME、MD、ED.设AB=4,∠DBE=30°.则△EDM的面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317011_ST/images0.png)
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317011_ST/0.png)
C.2
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D.
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已知:如图,四边形OABC是菱形,点C在x轴上,点A在直线y=x上,B点在反比例函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317010_ST/0.png)
的图象上,若菱形OABC的面积为
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,则此反比例函数的表达式为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317010_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317010_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317010_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317010_ST/4.png)
D.
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已知,如图:二次函数的图象如图所示,给出以下结论:
①a+b+c>0;②a-b+c<0;③b
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其中所有正确结论的序号是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192414554131765/SYS201311011924145541317009_ST/images0.png)
A.③④
B.①③
C.①④
D.①②③
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已知,如图:⊙I内切于△ABC,切点分别为D、E、F,若∠C=70°,则∠FDE=( )
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A.70°
B.65°
C.60°
D.55°
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