抛物线
过点A(-1,0),点B(3,0),顶点为C.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963771538472960/2967936321486848/STEM/8a55c5a7-bf3d-4d46-905a-6b12adc71a56.png?resizew=450)
(1)求抛物线的表达式及点C的坐标;
(2)如图1,点P在抛物线上,连接CP并延长交x轴于点D,连接AC,若△DAC是以AC为底的等腰三角形,求点P的坐标;
(3)如图2,在(2)的条件下,点E是线段AC上(与点A,C不重合)的动点,连接PE,作
,边EF交x轴于点F,当AF的长度最大时,求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963771538472960/2967936321486848/STEM/8a55c5a7-bf3d-4d46-905a-6b12adc71a56.png?resizew=450)
(1)求抛物线的表达式及点C的坐标;
(2)如图1,点P在抛物线上,连接CP并延长交x轴于点D,连接AC,若△DAC是以AC为底的等腰三角形,求点P的坐标;
(3)如图2,在(2)的条件下,点E是线段AC上(与点A,C不重合)的动点,连接PE,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ed04e08d287891ff58416cb460b3ab.png)
21-22九年级下·浙江湖州·期中 查看更多[4]
浙江省湖州市长兴县部分学校2021-2022学年九年级下学期精准教学阶段性综合分析材料(二)数学试题(已下线)重难点02 二次函数中相似三角形问题-2022-2023学年九年级数学考试满分全攻略(浙教版)(已下线)第1章 二次函数(基础、典型、易错、压轴)分类专项训练-2022-2023学年九年级数学考试满分全攻略(浙教版)(已下线)2022年浙江省湖州市中考数学真题变式题21-24题
更新时间:2022-04-28 15:44:48
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解答题-问答题
|
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(0.4)
【推荐1】综合与探究
如图,已知抛物线
与
轴交于
,
两点(点
在点
的左侧),与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/70dcf2cf-1451-41e2-91b3-86f9cb46f77d.png?resizew=289)
(1)求抛物线的解析式;
(2)在抛物线的对称轴上存在一点
,使得
的值最小,求此时点
的坐标为__________;
(3)点
是第一象限内抛物线上的一个动点(与点
不重合),过点
作
轴于点
,交直线
于点
,连接
,直线
把
的面积分成两部分,使
,请求出点
的坐标;
(4)若
为抛物线对称轴上一动点,是否存在点
,使得
是以
为直角边的直角三角形,若存在,请直接写出点
的坐标;若不存在,请说明理由.
如图,已知抛物线
![](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/8d71b3cb2a27fbe0d69357431c7575f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed3c2137215e045c43ece09e725381.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://img.xkw.com/dksih/QBM/editorImg/2023/12/30/70dcf2cf-1451-41e2-91b3-86f9cb46f77d.png?resizew=289)
(1)求抛物线的解析式;
(2)在抛物线的对称轴上存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1519f0bcc439f5286f936c7e411b3b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010989c488d7f0551c9f2aa8bba6bf1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811c4d6430a343d1561ffb1efe44a35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】根据以下素材,完成探索任务:
设计喷水器的高度 | ||
素材1 | 为了灌溉某花田,需要安装一台可![]() ![]() | |
素材2 | 为了方便计算该喷水器的灌溉范围,如图2,在初始高度下,测得喷水口点P到水平地面的距离为1米,喷射距离为10米,并发现喷头在旋转过程中,喷出的水柱外端恰好碰到距离连杆![]() | |
素材3 | 为了美观,现将原来的花田改造成一块由6块全等的等边三角形与1个正六边形组成的多边形花田(如图3),已知![]() | |
素材4 | 为了适应多种灌溉环境,这款喷水器除原装喷头外,还有一款“S”型号的喷头可供更换(如图4),并且![]() ![]() ![]() ![]() ![]() ![]() | |
任务1 | 确定水柱形状 | 在图2中建立合适的直角坐标系,求喷出水柱最外层抛物线的函数表达式. |
任务2 | 计算喷水口高度 | 若使用原装喷头的喷水器,要求通过![]() |
任务3 | 设计方案 | 园艺师计划分别在![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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名校
【推荐1】(2016山东省菏泽市)如图,△ACB和△DCE均为等腰三角形,点A,D,E在同一直线上,连接BE.
(1)如图1,若∠CAB=∠CBA=∠CDE=∠CED=50°
①求证:AD=BE;
②求∠AEB的度数.
(2)如图2,若∠ACB=∠DCE=120°,CM为△DCE中DE边上的高,BN为△ABE中AE边上的高,试证明:AE=
CM+
BN.
(1)如图1,若∠CAB=∠CBA=∠CDE=∠CED=50°
①求证:AD=BE;
②求∠AEB的度数.
(2)如图2,若∠ACB=∠DCE=120°,CM为△DCE中DE边上的高,BN为△ABE中AE边上的高,试证明:AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/19/fc10676d-8162-4c78-9e68-49cdfa9e1fb3.png?resizew=446)
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解题方法
【推荐2】我们知道,在等腰直角三角形中,底边与一边腰长比为
.如图1,
,
,则
.
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466152557789184/2466996536803328/STEM/42c8e1df6d724399bda1bd77c497057c.png?resizew=434)
知识应用:
(1)如图2,
和
均为等腰直角三角形,
,
,
,
三点共线,若
,
,求
的长.
知识外延:
(2)如图3,正方形
中,
和
关于
对称,
点的对应点为
点,
交
的延长线于
点,连接
.
①求证:
;
②若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d76e86c1dcc191aa8d51b3a528a454d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a4ad2d8d28ded93a059b029ba79dcb.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466152557789184/2466996536803328/STEM/42c8e1df6d724399bda1bd77c497057c.png?resizew=434)
知识应用:
(1)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc3d38eece4c30e57c101683cf18578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
知识外延:
(2)如图3,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fba413dc57687a5a6ee59a243654681.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐1】如图1,抛物线
交
轴于
,B两点,交
轴于点
,点
是抛物线的顶点.
(2)设点
在
轴上,且点
的坐标为
,连接
交抛物线于点
,连接
,求四边形
的面积.
(3)如图2,设点
为抛物线上一动点,过点
作
轴,垂足为
,交直线BC于点
.当
与
相似时,求点
的坐标.
(4)设点
是抛物线在第一象限内的一个动点,在坐标平面内是否存在以B,C,T为顶点的直角三角形?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/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723e5d013b530c3b52e1fc0b6f69e383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设点
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.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/a30fd4fbb921322af1262b7dd39f1ab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(3)如图2,设点
![](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/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6b2796810669792965515f7c722a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
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解题方法
【推荐2】如图,抛物线
交
轴于点
、
(
在
的左侧),交
轴于点
,且
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465590764683264/2466183912488960/STEM/eaef40350e4a4b25a8280ad64366d053.png?resizew=166)
(1)求抛物线的解析式;
(2)点
为第四象限抛物线上一点,过点
作
轴的平行线交
于点
,设
点横坐标为
,线段
的长度为
,求
与
的函数关系式.(不要求写出
的取值范围)
(3)在(2)的条件下,
为
延长线上一点,且
,连接
、
、
,
的面积为
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b736d8cb466f0dad19f905000aba4da0.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/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/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465590764683264/2466183912488960/STEM/eaef40350e4a4b25a8280ad64366d053.png?resizew=166)
(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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b5e026f7e355735ee2da31ebd781c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a255eacfaa1ace1eea7e071aa3a28f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e901d1bf0f255f77085d9bba5c35c334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8c7c8c8702adfbd6bcacc94a6bc661.png)
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较难
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【推荐1】如图①,对于平面内小于等于90°的
,我们不妨约定:若点P在
内部或边上,作
于点E,
于点F,则将
称为点P与
的“点角距”,记作
.如图②,在平面直角坐标系
中,x、y正半轴所组成的角为
.
(1)已知点
、点
则
_________,
_______;
(2)已知,
的半径为4,P是
上的动点,且满足
,求点P的横坐标的取值范围;
(3)如图③,在平面直角坐标系
中,抛物线
经过
与
两点,点Q是A、D之间的抛物线上的动点(点Q可以与A、D两点重合),求当
取最大值时点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051fcebdefb182073ebaa2ab2ad8159a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66075024f60fca9be9338c053032a997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245399c12a96b0c7b65fe389eb79cdfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e080cd6923aa79d1226e1f48062b936.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/6bb16719-6668-4778-9004-f0cd6a6bf8cb.png?resizew=376)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e358239cdfa5078bcecf62bb1739577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf03a930905fa691aeb882340e78b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6ee8be2b117606801c5139f105468a.png)
(2)已知,
![](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/c04ab4442ca5e1bf611dcd74b1590cb0.png)
(3)如图③,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c94973c2e451b54154e7a422a169777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e358239cdfa5078bcecf62bb1739577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e60f98107a82434d300b04c0cc72b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22aa59c6373bb2bf5e0b6f3ccd99a501.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/678a6cf2-c9df-49a3-b659-649c98ec5a4d.png?resizew=157)
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解答题-证明题
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较难
(0.4)
名校
【推荐2】如图,在平面直角坐标系xOy中,抛物线y=
x2+mx+n经过点B(6,1),C(5,0),且与y轴交于点A.
(1)求抛物线的表达式及点A的坐标;
(2)点P是y轴右侧抛物线上的一点,过点P作PQ⊥OA,交线段OA的延长线于点Q,如果∠PAB=45°.求证:△PQA∽△ACB;
(3)若点F是线段AB(不包含端点)上的一点,且点F关于AC的对称点F′恰好在上述抛物线上,求FF′的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求抛物线的表达式及点A的坐标;
(2)点P是y轴右侧抛物线上的一点,过点P作PQ⊥OA,交线段OA的延长线于点Q,如果∠PAB=45°.求证:△PQA∽△ACB;
(3)若点F是线段AB(不包含端点)上的一点,且点F关于AC的对称点F′恰好在上述抛物线上,求FF′的长.
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394413872545792/2394676331257856/STEM/4b2be6c10678408d957cf95a1d2c054f.png?resizew=211)
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解答题-问答题
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较难
(0.4)
【推荐3】锐角△ABC 中,BC=6,BC 边上的高 AD=4,两动点 M,N 分别在边 AB,AC 上滑动(M 不与 A、B 重合),且 MN∥BC,以 MN 为边向下作正方形 MPQN,设其边长为 x,正方形 MPQN 与△ABC 公共部分的面积为 y(y>0).
(1)MN,BC具备什么条件,△AMN∽△ABC;
(2)当 x为何值时,PQ 恰好落在边 BC 上(如图 1);
(3)当 PQ 在△ABC 外部时(如图 2),求 y 关于 x 的函数关系式(注明 x 的取值范围)并求出 x 为何值时 y 最大,最大值是多少?
(1)MN,BC具备什么条件,△AMN∽△ABC;
(2)当 x为何值时,PQ 恰好落在边 BC 上(如图 1);
(3)当 PQ 在△ABC 外部时(如图 2),求 y 关于 x 的函数关系式(注明 x 的取值范围)并求出 x 为何值时 y 最大,最大值是多少?
![](https://img.xkw.com/dksih/QBM/2018/12/28/2106358476193792/2108509128392704/STEM/f79444d6751a45d7a920e7696e728ab4.png?resizew=344)
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