如图,抛物线
交
轴于
,
两点,交
轴于点
,直线
交
于点
,交
轴于点
,交抛物线于点
,连接
.
(2)求线段
长度的最大值;
(3)过点
作
于点
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f605a7fc2f1064fe14882ee426839db.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/3b3edef8ba6f5a022d350a0abe2674e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbc4cad609f3cfdee8a17941ef1273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7251d14111473460f02a65c7531c51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
23-24九年级上·甘肃武威·期末 查看更多[2]
更新时间:2024-03-19 08:54:24
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相似题推荐
解答题-问答题
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【推荐1】定义:若一个函数图象上存在横、纵坐标相等的点,则称该点为这个函数图象的“等值点”,例如,点
是函数
的图象的“等值点”.
(1)分别判断函数
的图象上是否存在“等值点”?如果存在,求出“等值点”的坐标;如果不存在,说明理由;
(2)写出函数
的等值点坐标;
(3)若函数
的图象记为
,将其沿直线
翻折后的图象记为
.当
两部分组成的图象上恰有2个“等值点”时,请写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da7544af9e0d48ac4a99c8d5290f789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea05a2396e436b4df62d6328dbeaddc.png)
(1)分别判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d19cd3e75089b7e722fdadce425aa0.png)
(2)写出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a4c4b2cdcfa30171dc61ed24412f69.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24f252d43978c638dccdd3b1c902962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995386e3233c1da3b1dfeab3c96782a8.png)
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【推荐2】【问题实验】如图①,在地面
上有两根等长立柱
,
之间悬挂一根近似成抛物线
的绳子.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591699472384/2466236312838144/STEM/0a3a818e8b234d9c937d21f985c83251.png?resizew=634)
(1)求绳子最低点到地面的距离;
(2)如图②,因实际需要,需用一根立柱
撑起绳子.
①若在离
为4米的位置处用立柱
撑起,使立柱左侧的抛物线的最低点距
为1米,离地面1.8米,求
的长;
②将立柱
来回移动,移动过程中,在一定范围内,总保持立柱
左侧抛物线的形状不变,其函数表达式为
,当抛物线最低点到地面距离为0.5米时,求
的值.
【问题抽象】如图③,在平面直角坐标系中,函数
的图像记为
,函数
的图像记为
,其中
是常数,图像
、
合起来得到的图像记为
.
设
在
上的最低点纵坐标为
,当
时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fa1f50047247e6edac9c27a19f539c.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591699472384/2466236312838144/STEM/0a3a818e8b234d9c937d21f985c83251.png?resizew=634)
(1)求绳子最低点到地面的距离;
(2)如图②,因实际需要,需用一根立柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①若在离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②将立柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac3e723dce619db2dfa411bf8fcf249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
【问题抽象】如图③,在平面直角坐标系中,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64c93a07fc9fcfd058ff9ae7ad99428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0350112b06bc7f747a08ae67fc692054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f15586e5089aea9aad6dfe0ee9fc4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8112f9185c7d48b015d9cd0525616b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4637acebb44aeb865a060c8c4a79bd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,在平面直角坐标系中,已知A、B、C三点的坐标为
、
、
,点D是线段
的一动点,它以每秒2个单位速度从A点向O点运动,连接
过点D作
的垂线交
于E点,设D点的运动时间为t秒(
).
的中点时,
________;
(2)请用t的代数式表示
的长度,并求出t为何值时,
有最小值,是多少?
(3)若已知F点在直线
上,
,P为x轴上一点且
于点P,请直接写出满足此条件的P点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a0ba82c01d9a5c626cd24368747e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38acd1574bcb032b06786c84d8035d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab85df6d7fa4ab22fd112dbdb751bc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b296ba35a616c76a439ade4c4c78dc8a.png)
(2)请用t的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)若已知F点在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e2a939e43cddc67403717a4a65ce47.png)
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【推荐2】如图,正方形ABCD中,AB=6,点E在边CD上,且tan∠DAE=
,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG、CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/1bc104f2-13e3-46c6-8e1b-60396000504e.png?resizew=191)
(1)求证:△ABG≌△AFG;
(2)求BG的长;
(3)求sin∠FCE的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/1bc104f2-13e3-46c6-8e1b-60396000504e.png?resizew=191)
(1)求证:△ABG≌△AFG;
(2)求BG的长;
(3)求sin∠FCE的值.
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【推荐3】折纸,常常能为证明一个命题提供思路和方法.例如,在
中,
(如图1),怎样证明
呢?
把
沿
的平分线
翻折,因为
,所以点
落在
上的点
处(如图2).于是,由
,
,可得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/aae18fc3-f31d-488d-b634-d83d90d2f19f.png?resizew=298)
【感知】
(1)①如图2,在
中,若
,则
.
②如图2,在中,若
,求证:
;
【探究】
(2)若将图2中
是角平分线的条件改成
是高线,其他条件不变(图3),即在
中,
,请探索线段
之间的等量关系,并说明理由.
【拓展】
(3)如图4,在
中,
,
,点
是
边上的一个动点(不与
重合),将
沿
翻折,点
的对应点是点
.若以
为顶点的三角形是直角三角形,直接写出
的长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590c279daace2aa6f040433b1baf226f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ebcaf0a0d043d94769fb90e49668bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/aae18fc3-f31d-488d-b634-d83d90d2f19f.png?resizew=298)
【感知】
(1)①如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40983ec5fb849653fd27f85579495b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1939c1a2c9c76e762c21809bc400b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②如图2,在中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9af7ab732d431dd78e84db9586d3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5379afb2cfee7e10180ac68d40a05b13.png)
【探究】
(2)若将图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eced79c055b68ab19f86606eeac1851d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d1824e24151ef841a52d16df606d07.png)
【拓展】
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072f75788adfd0c9e5ae0f84f9581a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a942463f1626ac24741dee55cf1827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb929bc0d68ea1feb13fcc6cd9a7bf12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐1】如图,直线
与
相切于点
,点
在射线
上(不与点
重合),
为
的直径.
作
的切线
(不要求写作法,保留作图痕迹);
(2)点
为
上的一点,且
,延长
交直线
于点
,
①求证
;
②若
,当点
在射线
上运动时,
与
其中之一为定值,请作出判断并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a08599072e368d5a36cf72583853f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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①求证
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②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d4dcfeadc7dbe303edca05432ff6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cdbbcd3b4fbd05cf6053ee61eca798.png)
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【推荐2】已知:二次函数y=ax2+bx+6(a≠0)与x轴交于A、B两点(点A在点B的左侧),点A、点B的横坐标是一元二次方程x2﹣4x﹣12=0的两个根.
(1)请直接写出点A、点B的坐标.
(2)请求出该二次函数表达式及对称轴和顶点坐标.
(3)如图1,在二次函数对称轴上是否存在点P,使△APC的周长最小,若存在,请求出点P的坐标;若不存在,请说明理由.
(4)如图2,连接AC、BC,点Q是线段0B上一个动点(点Q不与点0、B重合).过点Q作QD∥AC交BC于点D,设Q点坐标(m,0),当△CDQ面积S最大时,求m的值.
(1)请直接写出点A、点B的坐标.
(2)请求出该二次函数表达式及对称轴和顶点坐标.
(3)如图1,在二次函数对称轴上是否存在点P,使△APC的周长最小,若存在,请求出点P的坐标;若不存在,请说明理由.
(4)如图2,连接AC、BC,点Q是线段0B上一个动点(点Q不与点0、B重合).过点Q作QD∥AC交BC于点D,设Q点坐标(m,0),当△CDQ面积S最大时,求m的值.
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795314257715200/2795776151601152/STEM/1bef5d33-09b8-45bc-a38e-ea3026675cfc.png?resizew=314)
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【推荐1】如图,在平面直角坐标系中,二次函数
的图象与x轴交于点A和点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/63461e1e-d6a7-49e6-947b-2184942f543b.png?resizew=398)
(1)求二次函数的表达式;
(2)连接
,找出图中与
相等的角,并说明理由;
(3)若点P是抛物线上一点,满足
,求点P的坐标;
(4)若点Q在第四象限内,且
,
,线段
是否存在最大值,如果存在,求出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58a0b2c6080621bac5724762e3cb2c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ac227415188548180ea445fc383647.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/63461e1e-d6a7-49e6-947b-2184942f543b.png?resizew=398)
(1)求二次函数的表达式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc1df99f9a3c9e22d2041a89e2880f.png)
(3)若点P是抛物线上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9177357c4268d8d0600825bf54c5edc2.png)
(4)若点Q在第四象限内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd70e4a3ca00411f4f4cad46f95698b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd8e64357ad1eff6337e6f0d42bbea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
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【推荐2】如图,直线y=5x+5交x轴于点A,交y轴于点C,过A,C两点的二次函数y=ax2+4x+c的图象交x轴于另一点B.
(1)求二次函数的表达式;
(2)连接BC,点N是线段BC上的动点,作ND⊥x轴交二次函数的图象于点D,求线段ND长度的最大值;
(3)若点H为二次函数y=ax2+4x+c图象的顶点,点M(4,m)是该二次函数图象上一点,在x轴,y轴上分别找点F,E,使四边形HEFM的周长最小,求出点F、E的坐标.
(1)求二次函数的表达式;
(2)连接BC,点N是线段BC上的动点,作ND⊥x轴交二次函数的图象于点D,求线段ND长度的最大值;
(3)若点H为二次函数y=ax2+4x+c图象的顶点,点M(4,m)是该二次函数图象上一点,在x轴,y轴上分别找点F,E,使四边形HEFM的周长最小,求出点F、E的坐标.
![](https://img.xkw.com/dksih/QBM/2019/1/11/2116385803845632/2117845741338624/STEM/f53aa3f222b34edb90ca186ab8fe7ff2.png?resizew=112)
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