如图,抛物线
(m>0)与x轴相交于A,B两点,点H是抛物线的顶点,以AB为直径作圆G交y轴于E,F两点,
.
(1). 用含m的代数式表示圆G的半径
的长;
(2).连结AH,求线段AH的长;
(3).点P是抛物线对称轴正半轴上的一点,且满足以P点为圆心的圆P与直线AH和圆G都相切,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8af82f1aa16e1d3863423fd937b82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3408b13a6b740b2e29f4e193b36ae80.png)
(1). 用含m的代数式表示圆G的半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f825a37dd9cb7745ef0000f304f6f5.png)
(2).连结AH,求线段AH的长;
(3).点P是抛物线对称轴正半轴上的一点,且满足以P点为圆心的圆P与直线AH和圆G都相切,求点P的坐标.
2011·湖南长沙·一模 查看更多[1]
(已下线)2011年湖南省长沙市九年级毕业学业模拟考试数学卷c
更新时间:2016-12-05 04:49:29
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【知识点】 抛物线与x轴的交点问题解读
相似题推荐
解答题-证明题
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较难
(0.4)
名校
【推荐1】已知抛物线
(a为常数).
(1)求证:无论a取任何实数,此抛物线与x轴总有两个不相同的交点;
(2)抛物线与x轴的两个交点为
,抛物线顶点为点D.
①若
是直角三角形两条直角边的长,该直角三角形斜边长为4,求a的值;
②点E在抛物线对称轴上,
是等腰三角形,求出点E的纵坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111582a8cf837f159f58235518653c8d.png)
(1)求证:无论a取任何实数,此抛物线与x轴总有两个不相同的交点;
(2)抛物线与x轴的两个交点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d39f4e3a69bdc841abc73b793ba4b0.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
②点E在抛物线对称轴上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图,已知:点
是直线
:
上的一动点,其横坐标为
(
是常数),点
是抛物线
:
的顶点.
![](https://img.xkw.com/dksih/QBM/2023/4/28/3226095300657152/3233507941998592/STEM/33283fa1356842b5be0632329920b31d.png?resizew=478)
(1)当点
在直线
运动时,抛物线
始终经过一个定点
,求点
的坐标,并判断点
是否是点
的最高位置?
(2)当点
在直线
运动时,点
也随之运动,此时直线
与抛物线
有两个交点
,
(
,
可以重合),
、
两点到
轴的距离之和为
.
①求
的取值范围;
②求
的最小值.
(3)连接
,当直线
与抛物线
的另一个交点也在线段
上时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b332ec132a23295db5f7dcbf18d46e73.png)
![](https://img.xkw.com/dksih/QBM/2023/4/28/3226095300657152/3233507941998592/STEM/33283fa1356842b5be0632329920b31d.png?resizew=478)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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