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若方程x2+ax+b=0有不小于2的实根,则a2+b2的最小值为( ) A.3 ...
若方程x
2+ax+b=0有不小于2的实根,则a
2+b
2的最小值为( )
A.3
B.
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C.
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D.
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考点分析:
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若点P在曲线y=x
3-3x
2+(3-
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)x+
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上移动,经过点P的切线的倾斜角为α,则角α的取值范围是( )
A.[0,
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)
B.[0,
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)∪[
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,π)
C.[
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,π)
D.[0,
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)∪(
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,
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]
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以直角坐标系的原点O为极点,x轴的正半轴为极轴.已知点P的直角坐标为(1,-5),点M的极坐标为(4,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356942686/SYS201310232120473569426010_ST/0.png)
).若直线l过点P,且倾斜角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356942686/SYS201310232120473569426010_ST/1.png)
,圆C以M为圆心、4为半径.
(Ⅰ)求直线l的参数方程和圆C的极坐标方程;
(Ⅱ)试判定直线l和圆C的位置关系.
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已知曲线C的极坐标方程是ρ=2sinθ,设直线l的参数方程是
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(t为参数).
(1)将曲线C的极坐标方程转化为直角坐标方程;
(2)设直线l与x轴的交点是M,N为曲线C上一动点,求|MN|的最大值.
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已知直线l的参数方程为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212047356942686/SYS201310232120473569426008_ST/0.png)
(t为参数),曲线C的参数方程为
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(Ⅰ)将曲线C的参数方程化为普通方程;
(Ⅱ)若直线l与线C交于A、B两点,求线段AB的长.
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已知圆锥曲线
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是参数)和定点
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,F
1、F
2是圆锥曲线的左、右焦点.
(1)求经过点F
2且垂直地于直线AF
1的直线l的参数方程;
(2)以坐标原点为极点,x轴的正半轴为极轴建立极坐标系,求直线AF
2的极坐标方程.
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