如图,已知二次函数
的图象与x轴交于点A,B,交y轴于点C,抛物线的顶点为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/d05be2db-36da-4086-8840-47fa51ad5b03.png?resizew=358)
(1)求抛物线顶点D的坐标以及直线
的函数表达式;
(2)点P是抛物线上一点,且点P在直线
下方,点E在抛物线对称轴上,当
的周长最小时,求
面积的最大值以及此时点P的坐标;
(3)在(2)的条件下,过点P且平行于
的直线分别交x轴于点M,交y轴于点N,把抛物线
沿对称轴上下平移,平移后抛物线的顶点为
,在平移的过程中,是否存在点
,使得点
,M,N三点构成的三角形为直角三角形,若存在,直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf20443cd488449d3de74c04097209d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/d05be2db-36da-4086-8840-47fa51ad5b03.png?resizew=358)
(1)求抛物线顶点D的坐标以及直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)点P是抛物线上一点,且点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
(3)在(2)的条件下,过点P且平行于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf20443cd488449d3de74c04097209d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae02bd1c82ca4f986a5a91fe47c71bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae02bd1c82ca4f986a5a91fe47c71bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae02bd1c82ca4f986a5a91fe47c71bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae02bd1c82ca4f986a5a91fe47c71bb5.png)
17-18九年级·重庆江津·阶段练习 查看更多[3]
2017-2018学年重庆市江津区六校九年级(上)第二次联考数学试卷重庆市荣昌区盘龙镇初级中学2018届九年级下学期第一次月考数学试题(已下线)学科网2018年4月2018届九年级第二次模拟大联考(湖北)-数学
更新时间:2018-04-02 10:47:47
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相似题推荐
解答题-证明题
|
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名校
【推荐1】已知:如图1.
,B在x轴上,点
在射线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/60fb3d57-d63c-4995-8f36-96e30cdcfaaa.jpg?resizew=697)
(1)若
,
,
.
①求证:点B为
的中点;
②如图2,点D在第四象限,
,
,连接
交x轴于点H,求点D和点H的坐标(直接写出答案);
(2)如图3,点E、F分别在坐标轴上,
,点P为
的内角平分线的交点,
、
分别交x轴、y轴于N、M两点,若点P的纵坐标为m,求
的周长(用含m的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e059a4147d1581bccafd8f6def319b55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/60fb3d57-d63c-4995-8f36-96e30cdcfaaa.jpg?resizew=697)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a81e971f501d78f5560c0c3d42f0f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82986ab38a4ae58593191ccae2a44f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
①求证:点B为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②如图2,点D在第四象限,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbab4a3f9636fe3eeee75ba79d08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图3,点E、F分别在坐标轴上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a10cc5df580f0823911ed73c8fc850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14aeac55d519010de23642ac22cfb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
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【推荐2】如图,设拋物线
与
轴交于A、
两点,与
轴交于
点.点
为该抛物线第四象限上的一点,过
作
轴交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/f037fb80-2782-41cd-a59a-7df8e23073ce.png?resizew=323)
(1)求直线
的解析式;
(2)求线段
的最大值;
(3)当
面积最大时,求点
的坐标;
(4)当
为等腰三角形时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92738aadeac1e3d3d8e919772bce727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fbd9b5e5d8be69373850d7faebdaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/f037fb80-2782-41cd-a59a-7df8e23073ce.png?resizew=323)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,在平面直角坐标系中,抛物线经过
、
、
三点,已知
,
,
.
(2)点
是抛物线上任意一点,若
,求点
的坐标;
(3)点
是抛物线上任意一点,若以
、
、
为顶点的三角形是直角三角形,请直接写出点
的坐标.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d04fbec3fd88935cd84ba3d22360771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图1,若△ABC和△ADE为等边三角形,M,N分别EB,CD的中点,易证:CD=BE,△AMN是等边三角形.
(1)当把△ADE绕A点旋转到图2的位置时,求证:CD=BE
(2)当△ADE绕A点旋转到图3的位置时,△AMN是否还是等边三角形?若是,请给出证明;若不是,说明理由.
(3)当AB=2AD时,直接写出△ADE与△ABC及△AMN的面积之比
(1)当把△ADE绕A点旋转到图2的位置时,求证:CD=BE
(2)当△ADE绕A点旋转到图3的位置时,△AMN是否还是等边三角形?若是,请给出证明;若不是,说明理由.
(3)当AB=2AD时,直接写出△ADE与△ABC及△AMN的面积之比
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/ca156307-b8e3-4cfc-a515-be6a2d80c21f.png?resizew=385)
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【推荐1】如图,抛物线经过
,
两点,且对称轴为直线
.
![](https://img.xkw.com/dksih/QBM/2022/12/17/3132716266782720/3157035000913920/STEM/3dfb5a5ab161413fb395ce02118dfb79.png?resizew=183)
(1)求抛物线的函数解析式;
(2)若直线
与抛物线交于点M,N,交x轴于点B,交y轴于点P,连接
,且
.
①求
的面积;
②在平面内是否存在点一是E,使E,C,N,M四点能构成平行四边形,如果存在,请直接写出点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://img.xkw.com/dksih/QBM/2022/12/17/3132716266782720/3157035000913920/STEM/3dfb5a5ab161413fb395ce02118dfb79.png?resizew=183)
(1)求抛物线的函数解析式;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fcf17d032f3e652e2b5cc50789bf3de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30b278d1c935666889febee9f03d9ea.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
②在平面内是否存在点一是E,使E,C,N,M四点能构成平行四边形,如果存在,请直接写出点E的坐标.
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解题方法
【推荐2】如图,在平面直角坐标系中,抛物线
与x轴交于点
,与y轴交于点C,点D为
的中点.
(2)点G是该抛物线对称轴上的动点,若
有最小值,求此时点G的坐标;
(3)若点P是第四象限内该抛物线上一动点,求
面积的最大值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e1102d7ce8e59b86975f4a2512861e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点G是该抛物线对称轴上的动点,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508015b3096bf9ccbc9b2ee70284f911.png)
(3)若点P是第四象限内该抛物线上一动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7f9f7952c4be18cb73393047c2ad75.png)
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【推荐3】如图,已知抛物线经过点A(-1,0)、B(3,0)、C(0,3)三点.
(2)求△ABC的面积.若P是抛物线上一点(异于点C),且满足△ABP的面积等于△ABC的面积,求满足条件的点P的坐标.
(3)点M是线段BC上的点(不与B,C重合),过M作MN∥
轴交抛物线于N,若点M的横坐标为
,请用含
的代数式表示线段MN的长.
(4)在(3)的条件下,连接NB、NC,则是否存在点M,使△BNC的面积最大?若存在,求
的值,并求出△BNC面积的最大值.若不存在,说明理由.
(1)求抛物线的解析式.
(2)求△ABC的面积.若P是抛物线上一点(异于点C),且满足△ABP的面积等于△ABC的面积,求满足条件的点P的坐标.
(3)点M是线段BC上的点(不与B,C重合),过M作MN∥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)在(3)的条件下,连接NB、NC,则是否存在点M,使△BNC的面积最大?若存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2017/10/25/1802835024150528/1805206798712832/STEM/ce610e68-d646-4db4-b8b0-98265f885a05.png)
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【推荐1】如图,抛物线y=﹣
x2+bx+c交x轴于A(﹣3,0),B(4,0)两点,与y轴交于点C,连接AC,BC.
(1)求此抛物线的表达式;
(2)求过B、C两点的直线的函数表达式;
(3)点P是第一象限内抛物线上的一个动点.过点P作PM⊥x轴,垂足为点M,PM交BC于点Q.试探究点P在运动过程中,是否存在这样的点Q,使得以A,C,Q为顶点的三角形是等腰三角形.若存在,请求出此时点P的坐标,若不存在,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求此抛物线的表达式;
(2)求过B、C两点的直线的函数表达式;
(3)点P是第一象限内抛物线上的一个动点.过点P作PM⊥x轴,垂足为点M,PM交BC于点Q.试探究点P在运动过程中,是否存在这样的点Q,使得以A,C,Q为顶点的三角形是等腰三角形.若存在,请求出此时点P的坐标,若不存在,请说明理由;
![](https://img.xkw.com/dksih/QBM/2020/3/7/2414276382564352/2414950665625600/STEM/e1273cdc652840739a995dd2d5c04089.png?resizew=170)
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【推荐2】抛物线
过点
,点
,顶点为C.
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922527826886656/2924102713876480/STEM/19084da0-4c72-4938-bcd6-929417866916.png?resizew=506)
(1)求抛物线的表达式及点C的坐标;
(2)如图1,点P在抛物线上,连接
并延长交x轴于点D,连接
,若
是以
为底的等腰三角形,求点P的坐标;
(3)如图2,在(2)的条件下,点E是线段
上(与点A,C不重合)的动点,连接
,作
,边
交x轴于点F,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922527826886656/2924102713876480/STEM/19084da0-4c72-4938-bcd6-929417866916.png?resizew=506)
(1)求抛物线的表达式及点C的坐标;
(2)如图1,点P在抛物线上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图2,在(2)的条件下,点E是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ed04e08d287891ff58416cb460b3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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