抛物线
与
轴交于
、
(
在
的左边),
轴交于
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/da4197c3-b542-4dc7-a2f7-30682e50faf9.png?resizew=283)
(1)求抛物线的解析式;
(2)如图1,直线
交抛物线于
两点,点
在抛物线上,且在直线
下方的,若以
为圆心的作
,当
与直线
相切时,求
最大半径
及此时
坐标;
(3)如图2,
是抛物线上一点,连接
交
轴于
,作
关于
轴对称的直线交抛物线于
,连接
,点
是
的中点,若
的纵坐标分别是
.求
的数量关系.
![](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/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba75f0d4da006078f1e7e6ae789c1619.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/da4197c3-b542-4dc7-a2f7-30682e50faf9.png?resizew=283)
(1)求抛物线的解析式;
(2)如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263cc6cae3fc3192c08f9e46c8fabb0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a040b8ceb73e1a433206e723bb05a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c244748194aba1b285baff4bd3df4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf2b59e9033bf427b3ca59c4d8d3bb9.png)
更新时间:2021-01-17 11:17:56
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知平面直角坐标系
中的点
和
,
的半径是4,交
轴于点
.对于点
给出如下定义:过点
的直线与
交于点
,点
为线段
的中点,我们把这样的点
叫做关于
的“弦中点”.
(1)如图1,已知点
;
①点
,
,
中是关于
的“弦中点”的是______;
②若一次函数
的图象上只存在一个关于
的“弦中点”,求
的值;
(2)如图2,若
,一次函数
的图象上存在关于
的“弦中点”,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/e89cbb50-9020-47d5-8c50-e02f6dfa2f59.png?resizew=452)
(1)如图1,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761664be69e3a89714acae64ce2394c.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d5face5943c82cde8f4c8c4681fc5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6502b17a6bc613003c5573d84d7c727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8825bd8b4a8205999cd7d1bbb9bcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②若一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66722f1682f6accd58c0e3c1af5f4db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】图 1 和图 2 中,优弧
纸片所在⊙O 的半径为 2,AB=2
,点 P为优弧
上一点(点 P 不与 A,B 重合),将图形沿 BP 折叠,得到点 A 的对称点 A′.
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109278599864320/2110179730489344/STEM/c059c9b82ea4416d832c289f079de2ca.png?resizew=420)
发现:
(1)点 O 到弦 AB 的距离是 ,当 BP 经过点 O 时,∠ABA′= ;
(2)当 BA′与⊙O 相切时,如图 2,求折痕的长.
拓展:把上图中的优弧纸片沿直径 MN 剪裁,得到半圆形纸片,点 P(不与点 M, N 重合)为半圆上一点,将圆形沿 NP 折叠,分别得到点 M,O 的对称点 A′, O′,设∠MNP=α.
(1)当α=15°时,过点 A′作 A′C∥MN,如图 3,判断 A′C 与半圆 O 的位置关系,并说明理由;
(2)如图 4,当α= °时,NA′与半圆 O 相切,当α= °时,点 O′落在
上.
(3)当线段 NO′与半圆 O 只有一个公共点 N 时,直接写出β的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109278599864320/2110179730489344/STEM/c059c9b82ea4416d832c289f079de2ca.png?resizew=420)
发现:
(1)点 O 到弦 AB 的距离是 ,当 BP 经过点 O 时,∠ABA′= ;
(2)当 BA′与⊙O 相切时,如图 2,求折痕的长.
拓展:把上图中的优弧纸片沿直径 MN 剪裁,得到半圆形纸片,点 P(不与点 M, N 重合)为半圆上一点,将圆形沿 NP 折叠,分别得到点 M,O 的对称点 A′, O′,设∠MNP=α.
(1)当α=15°时,过点 A′作 A′C∥MN,如图 3,判断 A′C 与半圆 O 的位置关系,并说明理由;
(2)如图 4,当α= °时,NA′与半圆 O 相切,当α= °时,点 O′落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa33d0f23b18d580b8b2afb0dfd0c43.png)
(3)当线段 NO′与半圆 O 只有一个公共点 N 时,直接写出β的取值范围.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知,如图,抛物线
与x轴交于A、B两点,与y轴交于点C,
,点P为x轴下方的抛物线上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/71e4760b-366b-4924-b634-17943f42d2f3.png?resizew=305)
(1)求抛物线的函数表达式;
(2)连接
,求四边形
面积的最大值;
(3)是否存在这样的点P,使得点P到
和
两边的距离相等,若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818ccf8040f189fff5665ec93892b2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5127b4e2f94f1a67a39f6f0af4968a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/71e4760b-366b-4924-b634-17943f42d2f3.png?resizew=305)
(1)求抛物线的函数表达式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e600ef0697e740639dc4ecfad0f8a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ee659d36a6fd486e2ca8d41c46f350.png)
(3)是否存在这样的点P,使得点P到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】如图,抛物线
与
轴交于
、
两点,与
轴交于点
,
,顶点为
.
![](https://img.xkw.com/dksih/QBM/2020/12/28/2623796531904512/2625890537709568/STEM/8e0847e4-0545-4687-84c2-5959e07ab86c.png)
(1)求此函数的关系式;
(2)在
下方的抛物线上有一点
,过点
作直线
轴,交
与点
,当点
坐标为多少时,线段
的长度最大?最大是多少?
(3)在对称轴上有一点
,在抛物线上有一点
,若使
,
,
,
为顶点形成平行四边形,求出
,
点的坐标.
(4)在
轴上是否存在一点
,使
为直角三角形,若存在,直接写出点
的坐标;若不存在,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/5963abe8f421bd99a2aaa94831a951e9.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/ac8afcd896c25f11b18ea574b37b60d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/12/28/2623796531904512/2625890537709568/STEM/8e0847e4-0545-4687-84c2-5959e07ab86c.png)
(1)求此函数的关系式;
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f301d81ded79d8f48421a3579c91f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)在对称轴上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(4)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】如图,点A在抛物线
上,过A作x轴的平行线交抛物线于另一点B,点C为抛物线上的任一点;
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573178368/STEM/03f80967-3f95-442e-a058-f7402c402bae.png?resizew=453)
(1)若点A的横坐标为﹣4,且△ABC为直角三角形时,求C点的坐标;
(2)当A点变化时,是否总存在C点,使得△ABC是直角三角形,若是总存在,请说明理由;若不是总存在,请直接写出点A纵坐标m的取值范围;
(3)若△ABC为直角三角形,AB边上的高为h,
①h的大小是否改变,若改变,请说明理由;不改变,请求出高的长度;
②若将抛物线的关系式由
换成y=ax2(a≠0),其余条件不发生改变,试猜想h与a的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573178368/STEM/03f80967-3f95-442e-a058-f7402c402bae.png?resizew=453)
(1)若点A的横坐标为﹣4,且△ABC为直角三角形时,求C点的坐标;
(2)当A点变化时,是否总存在C点,使得△ABC是直角三角形,若是总存在,请说明理由;若不是总存在,请直接写出点A纵坐标m的取值范围;
(3)若△ABC为直角三角形,AB边上的高为h,
①h的大小是否改变,若改变,请说明理由;不改变,请求出高的长度;
②若将抛物线的关系式由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
您最近一年使用:0次