在平面直角坐标系中,抛物线y=﹣x2+bx+c经过点A、B、C,已知A(﹣1,0),C(0,3).
(1)求抛物线的解析式;
(2)如图1,P为线段BC上一点,过点P作y轴的平行线,交抛物线于点D,当△CDP为等腰三角形时,求点P的坐标;
(3)如图2,抛物线的顶点为E,EF⊥x轴于点F,N是线段EF上一动点,M(m,0)是x轴一个动点,若∠MNC=90°,请求出m的取值范围.
(1)求抛物线的解析式;
(2)如图1,P为线段BC上一点,过点P作y轴的平行线,交抛物线于点D,当△CDP为等腰三角形时,求点P的坐标;
(3)如图2,抛物线的顶点为E,EF⊥x轴于点F,N是线段EF上一动点,M(m,0)是x轴一个动点,若∠MNC=90°,请求出m的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/52d77a6a-a196-4731-adcb-225fc69446e9.png?resizew=296)
更新时间:2019-06-21 19:17:19
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【知识点】 其他问题(二次函数综合)
相似题推荐
【推荐1】综合与探究
如图1,在平面直角坐标系中,抛物线
与
轴交于
两点(点
在点
的左侧),与
轴交于点
,
是
轴负半轴上一点,
,直线
与抛物线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/21d7047a-3ccc-45d9-a865-29374b02263f.png?resizew=537)
(1)求直线
的函数表达式.
(2)如图2,在线段
上有一条2个单位长度的动线段
(点
在点
的左侧),过点
作
轴的垂线,交抛物线于点
,交直线
于点
;过点
作
轴的垂线,交抛物线于点
,交直线
于点
,连接
,
.设点
的横坐标为
,请解答下列问题:
①线段
的长为______;(用含
的代数式表示)
②当
时,判断四边形
的形状,并说明理由;
③求当
为何值时,
.
(3)如图3,当点
在抛物线的对称轴上时,连接
.试探究:此时在第一象限内是否存在点
,使以
,
,
为顶点的三角形与
相似?若存在,请直接写出点
的坐标;若不存在,请说明理由.
如图1,在平面直角坐标系中,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3882b16f9ad3999cf54dcb7708b9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/21d7047a-3ccc-45d9-a865-29374b02263f.png?resizew=537)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54078c4af5b305e26b8e3faa6423e67e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb54c51338a3eaa4078b6c20124264e6.png)
③求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d72d238110b140310d475674adf2515.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐2】抛物线
与y轴交于点A,顶点为D.
(1)若抛物线过点
,求抛物线顶点D和点A坐标;
(2)如图,在(1)的条件下,连接
,点N为线段
下方抛物线上一点,求
面积的最大值;
(3)已知点
,
,若线段
与抛物线恰有一个交点,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e4fa447beeb4f963ca6dcd05d4822e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/8453cf29-ccdc-4451-9ea7-1bb0afd49ed3.png?resizew=141)
(1)若抛物线过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16290c9343bb9653eee9eea7567cd7d3.png)
(2)如图,在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7ad41b36674fd6e90176ee24cdefbb.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3dfcf2896f512c9b6ec997bd7868d25.png)
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您最近一年使用:0次