如图,抛物线
与x轴交于
两点,与y轴交于点C,抛物线的对称轴与抛物线交于点D,与轴x交于点E,连接
.
(1)求抛物线的解析式;
(2)连接
,在抛物线上存在点P,使得
,求出点P的坐标;
(3)连接
,点Q是线段
上的一个动点,过点Q作
的平行线l.在直线l上是否存在点H,使得以点Q,C,B,H为顶点的四边形为菱形,若存在,直接写出点H的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77527caa01efcfc28dadcc959af94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14ab678bf246999048cb60c13192c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/13bc20d5-7a5e-4142-86e6-7153308892cf.png?resizew=423)
(1)求抛物线的解析式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52510561b97899db8eb9237798ab169a.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
2023九年级·全国·专题练习 查看更多[1]
(已下线)专题10 二次函数-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)
更新时间:2023-08-06 18:48:15
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解答题-计算题
|
困难
(0.15)
【推荐1】已知抛物线
与
轴交于点
,与
轴交于
点.
(1)求抛物线的解析式;
(2)如图1,直线
(
)交抛物线于
点,交
于
点,且
,求
的值;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/d8aca514-f5d0-44d3-b4b0-e78daeb53937.png?resizew=227)
(3)如图2,若点
为抛物线
轴下方一点,直线
交
轴于
点,直线
交
轴于
点,试判断
三者之间的等量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9553fb9beb9ed49ea5f7a0f077884d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efd8a3331c265d114cbc694d517e456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求抛物线的解析式;
(2)如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9059219044592024f63637984f86be30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4b4854b4676463d55c7069725e1637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/d8aca514-f5d0-44d3-b4b0-e78daeb53937.png?resizew=227)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbec8b46231e412ddce55cc96634e182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bcbaedaccd034a6995eda3edd5a2a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f9971c317c080df2bf85ca4bba2904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62fbe72587d27b3eeb48abe809320de7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/d6c7d99f-ae9c-46a7-8ad4-0b69a6cb0557.png?resizew=229)
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解题方法
【推荐2】已知抛物线
与x轴交于
两点(点A在点B的左侧),与y轴的交点为
,其对称轴是直线
,点P是抛物线上第一象限内的点,过点P作
轴,垂足为Q,交
于点D,且点P的横坐标为a.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/271ffe82-8386-462d-9409-16b3bfbf4d53.png?resizew=295)
(1)求这条抛物线对应的函数表达式;
(2)如图1,过点C作
平行于x轴,交抛物线于点E,若点P在
的上方,连接
,
,
,当
时,求点P坐标;
(3)如图2,连接
,设
交
于点H,
的面积为
,
的面积为
,直接写出
的最大值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051ef731f266dbf72ccb19dc222bf2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c73cb74fd6c75858b4f82af19178fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/271ffe82-8386-462d-9409-16b3bfbf4d53.png?resizew=295)
(1)求这条抛物线对应的函数表达式;
(2)如图1,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4418268709ec70e8f770daaa9442dbb.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bc75797cbb516a4bc0cf8a438988fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c665061b7bbfab79f9a3a1e8a14239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐1】抛物线y=ax2+bx+c的图象与x轴交于A,B两点,与y轴交于点C,连接BC,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/708040f2-75de-4268-b322-7d8f4bdd2a60.png?resizew=203)
(1)分别求出抛物线和直线BC的函数表达式;
(2)在直线BC的下方抛物线的图象上找出一点N,使得△NBC的面积最大;
(3)在线段BC上是否存在点M,使得△MOC为等腰三角形,若存在,求出M点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/708040f2-75de-4268-b322-7d8f4bdd2a60.png?resizew=203)
(1)分别求出抛物线和直线BC的函数表达式;
(2)在直线BC的下方抛物线的图象上找出一点N,使得△NBC的面积最大;
(3)在线段BC上是否存在点M,使得△MOC为等腰三角形,若存在,求出M点的坐标;若不存在,请说明理由.
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【推荐2】如图是一块美术小组使用剩余的画布,将其放置在平面直角坐标系中,底部边缘
在x轴上,且
,外轮廓线是抛物线的一部分,对称轴为y轴,高度
,美术小组计划进行裁剪:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/cbc1ffef-2b3a-43cf-8b16-aca331790d67.png?resizew=208)
(1)若裁剪成正方形,要求一边在底部边缘
上且面积最大,求此正方形的边长;
(2)若裁剪成矩形,要求一边在底部边缘
上且周长最大,求此矩形的周长;
(3)若裁剪成圆,判断能否裁剪出半径为
的圆,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3614c5e351287527447998a15f749f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace7098e3cdb24b089c73ea1785bfa66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/cbc1ffef-2b3a-43cf-8b16-aca331790d67.png?resizew=208)
(1)若裁剪成正方形,要求一边在底部边缘
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若裁剪成矩形,要求一边在底部边缘
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若裁剪成圆,判断能否裁剪出半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ba808b096af28663c77e48fb808f1f.png)
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【推荐1】如图,抛物线y=ax2+x+c与x轴交于点A(6,0),C(﹣2,0),与y轴交于点B,抛物线的顶点为D,对称轴交AB于点E,交x轴于点F.
(1)求抛物线的解析式;
(2)P是抛物线上对称轴左侧一点,连接EP,若tan∠BEP=
,求点P的坐标;
(3)M是直线CD上一点,N是抛物线上一点,试判断是否存在这样的点N,使得以点B,E,M,N为顶点的四边形是平行四边形,若存在,请直接写出点N的坐标,若不存在,请说明理由.
(1)求抛物线的解析式;
(2)P是抛物线上对称轴左侧一点,连接EP,若tan∠BEP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)M是直线CD上一点,N是抛物线上一点,试判断是否存在这样的点N,使得以点B,E,M,N为顶点的四边形是平行四边形,若存在,请直接写出点N的坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/5/16/2463747735003136/2463880498987008/STEM/66ef8deface64186b43190a57508ec4c.png?resizew=425)
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真题
【推荐2】如图1,抛物线
交x轴于O,
两点,顶点为
.点C为
的中点.
的表达式;
(2)过点C作
,垂足为H,交抛物线于点E.求线段
的长.
(3)点D为线段
上一动点(O点除外),在
右侧作平行四边形
.
①如图2,当点F落在抛物线上时,求点F的坐标;
②如图3,连接
,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcff1114aa1a7d118ccbeec937a55c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7272800367fac5ade01f94e7a5c3ef5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eaf9ba52ee4a71dba4db49503e864d3.png)
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b95a5251406bd8cddf4e6a3402282d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)点D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d000a9d441370a43debf5845f5f41142.png)
①如图2,当点F落在抛物线上时,求点F的坐标;
②如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64150582c67a93f02edc6b751712f8a.png)
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