如图抛物线y=ax2+bx,过点A(4,0)和点B(6,2
),四边形OCBA是平行四边形,点M(t,0)为x轴正半轴上的点,点N为射线AB上的点,且AN=OM,点D为抛物线的顶点.
(1)求抛物线的解析式,并直接写出点D的坐标;
(2)当△AMN的周长最小时,求t的值;
(3)如图②,过点M作ME⊥x轴,交抛物线y=ax2+bx于点E,连接EM,AE,当△AME与△DOC相似时.请直接写出所有符合条件的点M坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求抛物线的解析式,并直接写出点D的坐标;
(2)当△AMN的周长最小时,求t的值;
(3)如图②,过点M作ME⊥x轴,交抛物线y=ax2+bx于点E,连接EM,AE,当△AME与△DOC相似时.请直接写出所有符合条件的点M坐标.
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075246021689344/2076200566054912/STEM/5c964268695f41ee90b44d9c8f609a75.png?resizew=437)
更新时间:2018-11-15 18:23:46
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相似题推荐
解答题-证明题
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(0.4)
【推荐1】射影定理:如图①,在
中,
,如果
,垂足为D,那么有下列结论:①
;②
;③
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/06ec99b0-d5e2-4cd6-9c9c-be0c076d42cb.png?resizew=300)
(1)请你证明射影定理中的结论③,即
.
【结论运用】请直接使用射影定理解决下面的问题.
(2)如图②,在正方形
中,O是对角线
、
的交点,点E在边
上,过点C作
,垂足为F,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46887681820d8e486bcb1a0d7c051bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098f2d934743e32a3668dd5e612716e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8295f0a59ad97161cbfddd55645c0feb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/06ec99b0-d5e2-4cd6-9c9c-be0c076d42cb.png?resizew=300)
(1)请你证明射影定理中的结论③,即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8295f0a59ad97161cbfddd55645c0feb.png)
【结论运用】请直接使用射影定理解决下面的问题.
(2)如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80125e48498ac9c548732e2af1b1758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16c9d2251b599dcad01448431fedf9e.png)
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【推荐2】已知点
、
分别是正方形
的边
、
上的点,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/1b3f21dd-2a5f-4d94-a971-c075f6d6ecf4.png?resizew=588)
(1)如图1,
,点
是边
的中点,点
是线段
的中点,连接
,求出线段
的长度;
(2)如图2,连接
、
,点
是线段
的中点,连接
,判断
与
之间的关系,并进行证明;
(3)如图3,
,连接
、
,点
是线段
的中点,连接
,点
为
的中点,点
为
的中点,连接
,当点
为
的三等分点时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/1b3f21dd-2a5f-4d94-a971-c075f6d6ecf4.png?resizew=588)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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名校
【推荐3】如图,四边形
是一张放在平面直角坐标系中的矩形纸片,
为原点,点
在
轴的正半轴上,点
在
轴的正半轴上,
、
是方程
的两个根(
),在
边上取一点
,将纸片沿
翻折,使点
恰好落在
边上的点
处.
(1)求
、
的长;
(2)求
、
两点的坐标;
(3)若线段
上有一动点
自
点沿
方向向
点匀速运动(点
运动到点
后停止运动),运动的速度为每秒
个单位长度,设运动的时间为
秒,过
点作
的平行线交
于点
,是否存在这样的
值,使以
、
、
为顶点的三角形为等腰三角形?若存在,请直接写出
值及相应的时刻点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/7ab39fee-237e-49b1-9e3a-95ab78aa5704.png?resizew=195)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】如图,抛物线y=ax2+bx+3与x轴交于A(1,0)、B(﹣3,0)两点,与y轴交于点C,设抛物线的顶点为D.
(1)求该抛物线的解析式与顶点D的坐标.
(2)试判断△BCD的形状,并说明理由.
(3)若点E在x轴上,点Q在抛物线上.是否存在以B、C、E、Q为顶点且以BC为一边的平行四边形?若存在,直接写出点Q的坐标;若不存在,请说明理由.
(4)探究坐标轴上是否存在点P,使得以P、A、C为顶点的三角形与△BCD相似?若存在,请直接写出点P的坐标;若不存在,请说明理由.
(1)求该抛物线的解析式与顶点D的坐标.
(2)试判断△BCD的形状,并说明理由.
(3)若点E在x轴上,点Q在抛物线上.是否存在以B、C、E、Q为顶点且以BC为一边的平行四边形?若存在,直接写出点Q的坐标;若不存在,请说明理由.
(4)探究坐标轴上是否存在点P,使得以P、A、C为顶点的三角形与△BCD相似?若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/16/2226697578463232/2227605612470272/STEM/5879ce6b1cf24b608a83c9c3707fb8a9.png?resizew=397)
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【推荐2】如图,抛物线y=ax2+bx+c经过A(1,0)、B(4,0)、C(0,3)三点.
![](https://img.xkw.com/dksih/QBM/2019/6/22/2230973694148608/2233382349168640/STEM/cdce1954726448f6a02aabf88e4eae8e.png?resizew=118)
(1)求该抛物线的解析式;
(2)如图,在抛物线的对称轴上是否存在点P,使得四边形PAOC的周长最小?若存在,求出四边形PAOC周长的最小值;若不存在,请说明理由.
(3)在(2)的条件下,点Q是线段OB上一动点,当△BPQ与△BAC相似时,求点Q的坐标.
![](https://img.xkw.com/dksih/QBM/2019/6/22/2230973694148608/2233382349168640/STEM/cdce1954726448f6a02aabf88e4eae8e.png?resizew=118)
(1)求该抛物线的解析式;
(2)如图,在抛物线的对称轴上是否存在点P,使得四边形PAOC的周长最小?若存在,求出四边形PAOC周长的最小值;若不存在,请说明理由.
(3)在(2)的条件下,点Q是线段OB上一动点,当△BPQ与△BAC相似时,求点Q的坐标.
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【推荐3】如图1,已知抛物线
与
轴交于A(-1,0),B两点,与
轴交于点C(0,-2)连接BC.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799352832/STEM/89604985039a4a39af2603c23ae0f52a.png?resizew=540)
(1)求抛物线的解析式与直线BC的解析式;
(2)点P是直线BC下方抛物线上一动点(不与B,C重合),当PD⊥BC于点D时,求出PD的最大值,并求此时点P的坐标;
(3)如图2,连接AC,抛物线的对称轴为直线EF,点M是直线EF右侧抛物线上一点,连接AM交EF于点Q,过点M作MN⊥EF于点N,是否存在这样的点M,使得△QMN与△ACO相似?若存在,请直接写出点M的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114da91d9b7124b283b3edcd50daf60d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949511903617024/2955868799352832/STEM/89604985039a4a39af2603c23ae0f52a.png?resizew=540)
(1)求抛物线的解析式与直线BC的解析式;
(2)点P是直线BC下方抛物线上一动点(不与B,C重合),当PD⊥BC于点D时,求出PD的最大值,并求此时点P的坐标;
(3)如图2,连接AC,抛物线的对称轴为直线EF,点M是直线EF右侧抛物线上一点,连接AM交EF于点Q,过点M作MN⊥EF于点N,是否存在这样的点M,使得△QMN与△ACO相似?若存在,请直接写出点M的坐标;若不存在,请说明理由.
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