计算:
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=
.(结果保留根号)
考点分析:
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DB是⊙O的切线,D为切点,过圆上一点C作DB的垂线,垂足为B,BC=3,sin∠A=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443009_ST/0.png)
,则⊙O的半径为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443009_ST/2.png)
C.
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D.
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已知b<0<a,则下列不等式组中一定无解的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443008_ST/2.png)
D.
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四边形ABCD的四条边长AB=
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,BC=5,CD=3,AD=2,∠D为直角,则∠A的外角的正切值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443007_ST/images1.png)
A.
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B.
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C.
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D.
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菱形ABCD中,如果
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185955939444346/SYS201311011859559394443006_ST/0.png)
AB
2=BD•AC,则∠ABC的度数是( )
A.60°
B.30°
C.60°或120°
D.30°或150°
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将一根铁丝围成一个等腰三角形,围成的三角形的底边长y与腰长x之间的函数关系可能为( )
A.
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B.
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C.
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D.
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