如图,抛物线
与x轴交于A、B两点(点A在原点右侧),与y轴交于点C.抛物线的对称轴交x轴于点E,交抛物线于点F,连接BC.
(1)求A、B、C三点坐标;
(2)如图,点P是线段
上一动点,过点P作
轴,交抛物线于点D,问当动点P运动到什么位置时,四边形
的面积最大?求出四边形
的最大面积及此时P点的坐标;
(3)坐标轴上是否存在点G,使以A,C,G为顶点的三角形与
相似?若存在,请直接写出所有满足条件的点G的坐标:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0781a9acdedd45dbdf6855f91ead86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/b0044b6b-11a1-4040-8256-b62fc5354943.png?resizew=290)
(1)求A、B、C三点坐标;
(2)如图,点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0861a397742dd3b40ab10488e7fa3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0861a397742dd3b40ab10488e7fa3e.png)
(3)坐标轴上是否存在点G,使以A,C,G为顶点的三角形与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
更新时间:2023-06-13 10:12:45
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【推荐1】定义:函数图象上到两坐标轴的距离之和小于或等于
的点,叫做这个函数图象的“
阶近距点”.例如,点
为函数
图象的“
阶近距点”;点
为函数
图象的“
阶近距点”.
(1)在①
;②
;③
三点中,是一次函数
图象的“
阶近距点”的有______、填序号);
(2)若
关于
的一次函数
的图象的“
阶近距点”不止一个,求
的取值范围;
(3)若
关于
的二次函数
图象的“
阶近距点”不存在,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4c79db0a729954363398f5f76503a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a601175b79bacfeeba904287a7ac24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0924ff22fff9f5639feb0ceeece80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5894f0258b4b0acb81412de25a8478de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(1)在①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e88ebfb5c0d6cce558b515be06404d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a112759bbf267b8ef9fb38d52e046c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f897df38ca5342682ac056a50a9b4f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2d6fefb0c4adafda5150a805e32903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐2】如图1,抛物线
的顶点坐标为
,且经过点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/a697a098-036c-49d0-b10a-8710974dcf04.png?resizew=539)
(1)求抛物线的解析式;
(2)如图2,若将抛物线
中在
轴下方的图象沿x轴翻折到
轴上方,
轴上方的图象保持不变,就得到了函数
,
是
图象上的任意一点,直线
是经过
且平行于
轴的直线,过点
作直线
的垂线,垂足为
,猜想并探究:
与
的差是否为定值?如果是,请求出此定值;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3f87e3fa613d0348046d2af82df356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d6146669cfd4312e904b86efd55de18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12052842f5d9761ab0ba56449ead2f56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/a697a098-036c-49d0-b10a-8710974dcf04.png?resizew=539)
(1)求抛物线的解析式;
(2)如图2,若将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3f87e3fa613d0348046d2af82df356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32a64a8a89363f8ef86ee3759a0c480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32a64a8a89363f8ef86ee3759a0c480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d5f1676dc00e9b0af4656ce047170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
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【推荐1】如图,抛物线y=﹣x2+bx+c经过点A(﹣3,0),点C(0,3),点D为二次函数的顶点,DE为二次函数的对称轴,点E在x轴上.
(1)求抛物线的解析式及顶点D的坐标;
(2)在抛物线A、C两点之间有一点F,使△FAC的面积最大,求F点坐标;
(3)直线DE上是否存在点P到直线AD的距离与到x轴的距离相等?若存在,请求出点P,若不存在,请说明理由.
(1)求抛物线的解析式及顶点D的坐标;
(2)在抛物线A、C两点之间有一点F,使△FAC的面积最大,求F点坐标;
(3)直线DE上是否存在点P到直线AD的距离与到x轴的距离相等?若存在,请求出点P,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/2/10/2395909006147584/2396145198727168/STEM/701544980906413c890f28910c216939.png?resizew=171)
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【推荐2】如图,已知抛物线
经过点
和点
,与
轴交于点
,抛物线的对称轴与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/b19275e7-d4bc-41b9-9870-8197c7a35129.png?resizew=305)
(1)求此抛物线的解析式;
(2)若点
是线段
上的一个动点(不点
重合),
轴交抛物线于点
,连接
,
,求
面积最大时点
坐标;
(3)点
关于点
的对称点为
在该抛物线上是否存在点
,使得
与
全等?若存在,请求出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e879263725e299745ff51d3c987ff7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881b1640911274127b9aa3d647ee903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/b19275e7-d4bc-41b9-9870-8197c7a35129.png?resizew=305)
(1)求此抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fd7e77d8082dd9e8ab254948ac08e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ac4c9567e701a0424e02f97700c31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
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【推荐1】如图,在平面直角坐标系xOy中,抛物线
与两坐标轴分别相交于A,B,C三点
(1)求证:∠ACB=90°
(2)点D是第一象限内该抛物线上的动点,过点D作x轴的垂线交BC于点E,交x轴于点F.
①求DE+BF的最大值;
②点G是AC的中点,若以点C,D,E为顶点的三角形与
AOG相似,求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fb55fe9a895607f89b2c0e0b8dedaa.png)
(1)求证:∠ACB=90°
(2)点D是第一象限内该抛物线上的动点,过点D作x轴的垂线交BC于点E,交x轴于点F.
①求DE+BF的最大值;
②点G是AC的中点,若以点C,D,E为顶点的三角形与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐2】如图,已知抛物线
(
为常数)经过点
,与
轴相 交于点
、
(点
在点
的右侧).
(1)求抛物线的解析式和点
的坐标;
(2)将直线
向下平移
(
)个单位长度后,得到的直线与抛物线只有一个公共点
,求点
的坐标;
(3)在(2)的条件下,连接
、
,在
正半轴上是否存在点
,使以
、
、
为顶点的三角形与
相似.若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a69144e8a38f3ed31018d5a21b026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f5d5c15db5be0ead8a86471573f1bd.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求抛物线的解析式和点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4bac077082718081f4bee07650f307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/46e17875-667b-48a6-afa3-a422e46b48ef.png?resizew=296)
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【推荐3】已知:如图1,二次函数y=ax2﹣2ax+c(a>0)的图象与y轴交于点C(0,﹣4),与x轴交于点A、B两点,点A的坐标为(4,0).
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573984196755456/1573984203268096/STEM/e9466ede4f7b4985895077e01cfd441f.png)
(1)求该抛物线的函数解析式;
(2)点P(t,0)是线段OB上一动点(不与O、B重合),点E是线段BC上的点,以点B、P、E为顶点的三角形与三角形ABC相似,连结CP,求△CPE的面积S与t的函数关系式;
(3)如图2,若平行于x轴的动直线与该抛物线交于点Q,与直线AC交于点F,点D的坐标为(2,0),则存在这样的直线,使得△ODF为等腰三角形,请直接写出点Q坐标.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573984196755456/1573984203268096/STEM/e9466ede4f7b4985895077e01cfd441f.png)
(1)求该抛物线的函数解析式;
(2)点P(t,0)是线段OB上一动点(不与O、B重合),点E是线段BC上的点,以点B、P、E为顶点的三角形与三角形ABC相似,连结CP,求△CPE的面积S与t的函数关系式;
(3)如图2,若平行于x轴的动直线与该抛物线交于点Q,与直线AC交于点F,点D的坐标为(2,0),则存在这样的直线,使得△ODF为等腰三角形,请直接写出点Q坐标.
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