如图,已知二次函数
的图象与
轴交于点
和点
,与
轴相交于点
.
(1)求该二次函数的解析式;
(2)点
在线段
上运动,过点
作
轴的垂线,与
交于点
,与抛物线交于点
.
①连接
,
,当四边形
的面积最大时,求此时点
的坐标和四边形
面积的最大值;
②探究是否存在点
使得以点
,
,
为顶点的三角形与
相似?若存在,求出点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.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/1dc03fafb03395ed84030f03c5d93aa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/c09dd38b-52ef-44fc-9613-c7696e136077.png?resizew=411)
(1)求该二次函数的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ee659d36a6fd486e2ca8d41c46f350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ee659d36a6fd486e2ca8d41c46f350.png)
②探究是否存在点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41984f53bb280ba8b5ac00a52ce2825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
更新时间:2023-10-30 17:56:28
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相似题推荐
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【推荐1】如图,已知抛物线y=ax2﹣5ax+2(a≠0)与y轴交于点C,与x轴交于点A(1,0)和点B.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574236425535488/1574236431302656/STEM/8b41f179d0c84fbf8e5413bf52b144f0.png)
(1)求抛物线的解析式;
(2)求直线BC的解析式;
(3)若点N是抛物线上的动点,且点N在第四象限内,过点N作NH⊥x轴,垂足为H,以B,N,H为顶点的三角形是否能够与△OBC相似?若能,请求出所有符合条件点N的坐标;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1574236425535488/1574236431302656/STEM/8b41f179d0c84fbf8e5413bf52b144f0.png)
(1)求抛物线的解析式;
(2)求直线BC的解析式;
(3)若点N是抛物线上的动点,且点N在第四象限内,过点N作NH⊥x轴,垂足为H,以B,N,H为顶点的三角形是否能够与△OBC相似?若能,请求出所有符合条件点N的坐标;若不能,请说明理由.
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【推荐2】在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/735ddb88-7c4d-4baa-9ee7-1d972de49b8d.png?resizew=481)
(1)如图,当
时,取
上一点D,取
上一点E,连接
,
.若
平分
,
,求
的长;
(2)如图2,当
时,取
上一点F,取
上一点G,连接
,
,延长
至点H,连接
.已知
,
,求证:
;
(3)当
,点P在
内部时,连接
,
,
.当
的值最小时,请直接写
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/735ddb88-7c4d-4baa-9ee7-1d972de49b8d.png?resizew=481)
(1)如图,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e343510d82161bb1da2f17403f5d1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5ac003c5ec5bd202185f5beed79be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373fe796c3696d9d9bf5f335d25caffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee4cd08cd69823d63b2375499f11677.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8257f74f5cec5062fdb21ea411391ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f694da9df04a7771740f4f7afae453c.png)
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【推荐1】如图,在平面直角坐标系中,抛物线
与x轴交于点A、点
,与y轴交于点
,连接AC,BC.点E是线段OB上动点(不与O、B两点重合),过点E作x轴的垂线l,设直线l与BC交于点D,与抛物线交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/78c59de7-2490-4539-b39c-6ef287dc2af9.png?resizew=183)
(1)求抛物线的表达式;
(2)连接AP,当
和
相似时,求点P的坐标;
(3)过点Р作
,垂足为F,求
面积的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0caa0652817b640c851664ea916a4e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/78c59de7-2490-4539-b39c-6ef287dc2af9.png?resizew=183)
(1)求抛物线的表达式;
(2)连接AP,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66aac85b3ff48c1516ff40362004cdbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)过点Р作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edadd9995393ece0d7b7bf4801504bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84795f73eab5fda5cc54dd3310553cd.png)
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【推荐2】如图,P是边长为1的正方形ABCD对角线AC上一动点(P与A、C不重合),点E在线段BC上,且PE=PB.
(1)求证:①PE=PD;②PE⊥PD;
(2)设AP=x,△PBE的面积为y.
①求出y关于x的函数关系式,并写出x的取值范围;
②当x取何值时,y取得最大值,并求出这个最大值.
(1)求证:①PE=PD;②PE⊥PD;
(2)设AP=x,△PBE的面积为y.
①求出y关于x的函数关系式,并写出x的取值范围;
②当x取何值时,y取得最大值,并求出这个最大值.
![](https://img.xkw.com/dksih/QBM/2017/8/17/1753855423791104/1754118000312320/STEM/f2393007596048d7bca7ac0a3112bfcc.png?resizew=135)
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解题方法
【推荐1】如图,抛物线
交
轴于
两点,交
轴于点
直线
经过点
.
![](https://img.xkw.com/dksih/QBM/2020/4/5/2441998690484224/2443284701995008/STEM/ec68da21-488f-470c-9115-13f237a74a3b.png)
(1)求抛物线的解析式;
(2)点
是直线
下方的抛物线上一动点,过点
作
轴于点
交直线
于点
设点
的横坐标为
若
求
的值;
(3)
是第一象限对称轴右侧抛物线上的一点,连接
抛物线的对称轴上是否存在点
.使得
与
相似,且
为直角,若存在,请直接写出点
的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ffd25dfc589c6698770e7d0af94318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://img.xkw.com/dksih/QBM/2020/4/5/2441998690484224/2443284701995008/STEM/ec68da21-488f-470c-9115-13f237a74a3b.png)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae95e96ce568efee50145f8d017353df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e4ca8b58be33aa0b01f29308367f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af00a2603bb1c492527537d60949c76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c40b92df80274b771e86aafe97e6010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc703acb4cf71a95ec74a6d18391960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42cf895fb6ac11a5a88dd5ab5e6cd8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e470b9b1ab6b8db7d19dc1e48ad6f09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图,点A,B都在x轴上,过点A作x轴的垂线交抛物线
于点C,过点B作x轴的垂线交该抛物线于点D,点C,D都在第一象限,点D在点C的右侧,
于点E,连结
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629504993550336/2633981341499392/STEM/f1becc9c-0d95-46f5-9a52-e8ab72e1a73a.png)
(1)若
,求
的长.
(2)若点A是线段
的中点,求点E的坐标.
(3)根据(2)的条件,连结
,动点P在线段
上,作
交
于点Q,当
与
相似时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572f286fb45b2757af63569ae0bc2e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de728cae820b49ee7164cdbe600bdc92.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629504993550336/2633981341499392/STEM/f1becc9c-0d95-46f5-9a52-e8ab72e1a73a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点A是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)根据(2)的条件,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f10966af97a837c746750ef3f75fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a138fefcb02cc063b48967c0fc9d28f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c5a63e1e1b9044d3b37d0599915a18.png)
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