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过直线y=x上的一点作圆(x-5)2+(y-1)2=2的两条切线l1,l2,当直...
过直线y=x上的一点作圆(x-5)2+(y-1)2=2的两条切线l1,l2,当直线l1,l2关于y=x对称时,它们之间的夹角为( )
A.30°
B.45°
C.60°
D.90°
考点分析:
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若直线y=kx+1与圆x
2+y
2=1相交于P、Q两点,且∠POQ=120°(其中O为原点),则k的值为( )
A.
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B.
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C.
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D.
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设直线过点(0,a),其斜率为1,且与圆x
2+y
2=2相切,则a的值为( )
A.±
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B.±2
C.±2
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D.±4
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动点A在圆x
2+y
2=1上移动时,它与定点B(3,0)连线的中点的轨迹方程是( )
A.(x+3)
2+y
2=4
B.(x-3)
2+y
2=1
C.(2x-3)
2+4y
2=1
D.(x+3)
2+y
2=
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直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225355936485223/SYS201311012253559364852004_ST/0.png)
截圆x
2+y
2=4所得的弦长是( )
A.1
B.
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C.2
D.
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y=|x|的图形和圆x
2+y
2=4所围成的较小面积是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225355936485223/SYS201311012253559364852003_ST/0.png)
B.π
C.
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D.
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