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若圆心在x轴上、半径为的圆O位于y轴左侧,且与直线x+y=0相切,则圆O的方程是...
若圆心在x轴上、半径为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211921500409200/SYS201310232119215004092007_ST/0.png)
的圆O位于y轴左侧,且与直线x+y=0相切,则圆O的方程是
.
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(θ∈[0,2π))有两个不同的公共点,则实数b的取值范围为( ).
A.
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B.
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C.
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直线y=
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与圆心为D的圆
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(θ∈[0,2π))交与A、B两点,则直线AD与BD的倾斜角之和为( )
A.
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B.
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C.
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C.
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D.
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D.[-
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有公共点,则b的取值范围是( )
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,
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