在平面直角坐标系
中,已知二次函数
的图象与
轴交于
两点(点
在点
的左边),与
轴交于点
,其顶点的横坐标为1,且过点
和
.
(1)求此二次函数的表达式;
(2)若直线
与线段
交于点
(不与点
重合),则是否存在这样的直线
,使得以
为顶点的三角形与
相似?若存在,求出该直线的函数表达式及点
的坐标;若不存在,请说明理由;
(3)若点
是位于该二次函数对称轴右边图象上不与顶点重合的任意一点,试比较锐角
与
的大小(不必证明),并写出此时点
的横坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.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/1e4a31520b40dce41e7a3e706a54ef55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bea6e70646324ded2b02b028d40ef62.png)
(1)求此二次函数的表达式;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f5009709cb959ee06ac660f6e4f88f.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/12eb814bb12c2e8d3c6de69a73e972ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a82f3fc9083b3b2d9935dae60eb8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa7fbc7b988629b037c04c4c3ce4678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc1df99f9a3c9e22d2041a89e2880f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4838f8ecdec6c290073935e718ee03bb.png)
![](https://img.xkw.com/dksih/QBM/2021/3/28/2687866582106112/2688179661291520/STEM/c1e34e38-1fd9-472d-972f-10773b0bd14e.png)
2021九年级·陕西·专题练习 查看更多[1]
(已下线)类型六 二次函数与三角形全等、相似(位似)问题-2021年《三步冲刺中考·数学》(陕西专用)之第2步大题夺高分
更新时间:2021-03-29 09:38:25
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相似题推荐
解答题-问答题
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名校
【推荐1】如图,已知抛物线
与x轴交于
两点(点A在点B的左侧),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/9d5cabe1-82d8-4ced-9f3b-1edc3763cc1d.png?resizew=484)
(1)求抛物线的解析式;
(2)如图,P为直线BC上方的抛物线上一点,
轴交BC于D点,过点D作
于E点.设
,求m的最大值及此时P点坐标;
(3)在(2)中m取得最大值时条件下,将该抛物线沿水平方向向左平移3个单位,点F为点P的对应点,平移后的抛物线与y轴交于点H,M为平移后的抛物线的对称轴上一点.使得以点F,H,M为顶点的三角形是等腰三角形,写出所有符合条件的点M的坐标,并写出求解点M的坐标的其中一种情况的过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca97516f9b88fcba781529e7b8823e4e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/9d5cabe1-82d8-4ced-9f3b-1edc3763cc1d.png?resizew=484)
(1)求抛物线的解析式;
(2)如图,P为直线BC上方的抛物线上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73a38b2b88a7fb833ce6d2ad0e54b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b0f70b55b5ebcb980a3e490d5d3806f.png)
(3)在(2)中m取得最大值时条件下,将该抛物线沿水平方向向左平移3个单位,点F为点P的对应点,平移后的抛物线与y轴交于点H,M为平移后的抛物线的对称轴上一点.使得以点F,H,M为顶点的三角形是等腰三角形,写出所有符合条件的点M的坐标,并写出求解点M的坐标的其中一种情况的过程.
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【推荐2】如图,抛物线
与
轴相交于点
,与
轴相交于点
,顶点为
,连结
.
(1)求抛物线的解析式;
(2)在抛物线的对称轴上有一点
,若
,求
点坐标;
(3)在抛物线上一点
,若
有一个内角为45°,求
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933fb2186f4f0d73a8e47ae3cedc43d.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/27/9aeb367f-8116-432b-9531-4193f8d15a81.png?resizew=167)
(1)求抛物线的解析式;
(2)在抛物线的对称轴上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a490879b6005750f6017a2f81fd147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在抛物线上一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e707ff4dbc594aef943e561a3d65598d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】【教材呈现】北师大版九年级上册数学教材12页给出直角三角形的斜边中线定理.
定理:直角三角形斜边上的中线等于斜边的一半.
上述定理的部分推理过程如下:
已知:如图1,在
中,
,CD为斜边AB上的中线.
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:如图2,延长CD至点E,使
,连接AE,BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/624adb60-1b5c-4e44-ae8c-3f8f2d51fb69.png?resizew=535)
(1)【定理探索】
请结合图2将证明过程补完整;
(2)【问题解决】
如图3,在
中,AD是高,CE是中线,点F是CE的中点,
,点F为垂足,若
,则
______度;
(3)【应用探究】
如图4,
和
均为直角三角形,
,
,连接CD交AB于点E,已知
,
,请直接写出CD的长.
定理:直角三角形斜边上的中线等于斜边的一半.
上述定理的部分推理过程如下:
已知:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:如图2,延长CD至点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/624adb60-1b5c-4e44-ae8c-3f8f2d51fb69.png?resizew=535)
(1)【定理探索】
请结合图2将证明过程补完整;
(2)【问题解决】
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1893d78af450a5fa09810537adc2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4555375ff2745d5882018c2714d5918d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753dbb5a670dd4f5e23bb919e44dda2.png)
(3)【应用探究】
如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5803057c922ab9a99b60c2a8dda9adf9.png)
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【推荐2】AB,AC为⊙O的弦,AB=AC.
(1)如图(1),求证:∠BAO=∠CAO;
(2)如图(2),BD为⊙O的弦,过点D作OA的垂线交⊙O于点E,连接CE,求证:BD=CE;
(3)如图(3),在(2)的条件下,连接CD交AB于点F,连接OF,AE,若OF⊥AB,FD=5,S△ACE=30,求DE的长.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698733797113856/2699895446929408/STEM/8f71f16dfa5b4e1cb543857346dec767.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698733797113856/2699895446929408/STEM/3415b4874db84e0badc39957feae3c3d.png?resizew=170)
(1)如图(1),求证:∠BAO=∠CAO;
(2)如图(2),BD为⊙O的弦,过点D作OA的垂线交⊙O于点E,连接CE,求证:BD=CE;
(3)如图(3),在(2)的条件下,连接CD交AB于点F,连接OF,AE,若OF⊥AB,FD=5,S△ACE=30,求DE的长.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698733797113856/2699895446929408/STEM/8f71f16dfa5b4e1cb543857346dec767.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698733797113856/2699895446929408/STEM/3415b4874db84e0badc39957feae3c3d.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698733797113856/2699895446929408/STEM/a4c6e93a16944cc0bc3f46072243905b.png?resizew=172)
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解题方法
【推荐1】如图,抛物线y=ax2+bx+c与x轴交于A(﹣1,0),B,与y轴正半轴交于C,OB=OC=3OA.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2954304447832064/2957885806133248/STEM/fde15aa5-60b5-469b-b707-25992a56c1db.png?resizew=649)
(1)求这条抛物线的解析式.
(2)如图1,在抛物线对称轴上求一点P,使CP⊥BP.
(3)如图2,若点E在抛物线对称轴上,在抛物线上是否存在点F,使以B,C,E,F为顶点的四边形是平行四边形,若存在,求出点F的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2954304447832064/2957885806133248/STEM/fde15aa5-60b5-469b-b707-25992a56c1db.png?resizew=649)
(1)求这条抛物线的解析式.
(2)如图1,在抛物线对称轴上求一点P,使CP⊥BP.
(3)如图2,若点E在抛物线对称轴上,在抛物线上是否存在点F,使以B,C,E,F为顶点的四边形是平行四边形,若存在,求出点F的坐标;若不存在,请说明理由.
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【推荐2】已知抛物线
的顶点为
,点
、
在该抛物线上.
(1)当
时,①求顶点P的坐标;②求
的值;
(2)当
恒成立时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6461dfb7acde6f73b98416398f11cd93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595635fff405d932a46f1b519d753e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157737b863aad8aa85f90d185f279f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594944c771bc4212efc917f4ad7128a4.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347bae1f6dbe41ed5b2b44a8ed69b6ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2ef01318841b0dd6dd6de77f03ebb6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799df415a826f84df12686400abf9da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2ef01318841b0dd6dd6de77f03ebb6.png)
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【推荐3】定义:一组对角相等,另一组对角不相等的四边形叫做“等对角四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/cf6fb833-cccd-414d-9b13-5f4d692ab056.png?resizew=485)
(1)如图1,在Rt△ACB中,∠C=90°,AC=4,BC=3,CD平分∠ACB,点E在直线AC上,以点B、C、E、D为顶点构成的四边形为“等对角四边形”,求AE的长.
(2)游山玩水是人们喜爱的一项户外运动,但过度的旅游开发会对环境及动植物的多样性产生影响.如图③,△ABC所在区域是某地著名的“黄花岭”风景区示意图,点B位置是国家珍稀动植物核心保护区,其中∠C=90°,BC=6km,AC=8km,该地旅游部门为科学合理开发此风景区旅游资源,计划在景区外围D点建一个“岭南山庄”度假村,据实际情况,规划局要求:四边形ABCD是一个“等对角四边形”(∠BCD≠∠BAD),核心区B与山庄D之间要尽可能远,并且四边形ABCD区域的面积要控制在56km2以内.请问BD是否存在最大值,规划局的要求能否实现?如果能,请求出BD的最大值及此时四边形ABCD的面积;如果不能,请说明理由.
(3)如图3,在平面直角坐标系xOy中,四边形ABCD是“等对角四边形”,其中A(﹣2,0)、C(2,0)、B(﹣1,﹣
),点D在y轴上,抛物线过点A、C,点P在抛物线上,满足∠APC=
∠ADC的点至少有3个时,总有不等式2n﹣
≤2c2+16a﹣8
成立,直接写出n的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/cf6fb833-cccd-414d-9b13-5f4d692ab056.png?resizew=485)
(1)如图1,在Rt△ACB中,∠C=90°,AC=4,BC=3,CD平分∠ACB,点E在直线AC上,以点B、C、E、D为顶点构成的四边形为“等对角四边形”,求AE的长.
(2)游山玩水是人们喜爱的一项户外运动,但过度的旅游开发会对环境及动植物的多样性产生影响.如图③,△ABC所在区域是某地著名的“黄花岭”风景区示意图,点B位置是国家珍稀动植物核心保护区,其中∠C=90°,BC=6km,AC=8km,该地旅游部门为科学合理开发此风景区旅游资源,计划在景区外围D点建一个“岭南山庄”度假村,据实际情况,规划局要求:四边形ABCD是一个“等对角四边形”(∠BCD≠∠BAD),核心区B与山庄D之间要尽可能远,并且四边形ABCD区域的面积要控制在56km2以内.请问BD是否存在最大值,规划局的要求能否实现?如果能,请求出BD的最大值及此时四边形ABCD的面积;如果不能,请说明理由.
(3)如图3,在平面直角坐标系xOy中,四边形ABCD是“等对角四边形”,其中A(﹣2,0)、C(2,0)、B(﹣1,﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31da7291140e430a11e2a10cc6cdefbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】综合与探究
如图,抛物线
上的点A,C坐标分别为
,
,抛物线与x轴负半轴交于点B,点M为y轴负半轴上一点,且
,连接
,
.
(2)点P是抛物线位于第一象限图象上的动点,连接
,
,当
时,求点P的坐标;
(3)点D是线段
(包含点B,C)上的动点,过点D作x轴的垂线,交抛物线于点Q,交直线
于点N,若以点Q,N,C为顶点的三角形与
相似,请直接写出点Q的坐标;
(4)将抛物线沿x轴的负方向平移得到新抛物线,点A的对应点为点
,点C的对应点为点
,在抛物线平移过程中,当
的值最小时,新抛物线的顶点坐标为______,
的最小值为______.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a7c043568fa59967d1cf74ceb310f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
(2)点P是抛物线位于第一象限图象上的动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80f4cb4b4158493eeb50afbfc194d5d.png)
(3)点D是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8caca03e0c81d4cd5925ff6b2d576613.png)
(4)将抛物线沿x轴的负方向平移得到新抛物线,点A的对应点为点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a795bdd51e9b33648232369edb16b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a795bdd51e9b33648232369edb16b8.png)
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困难
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【推荐2】已知直线
与抛物线
有唯一公共点
,直线
分别交
轴,
轴于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/23185c0f-fdef-47ef-8838-da439506fd42.png?resizew=501)
(1)如图1,当
,
时,求
的值;
(2)如图2,当
时,过点
作直线
的垂线交
轴于点
,求
坐标;
(3)如图3,当
时,平移直线
,使之与抛物线
交于
两点,点
关于
轴的对称点为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6885b4fa87718a51da916bbde8e13f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4faa8db4ab758990207106318a9ce07.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/23185c0f-fdef-47ef-8838-da439506fd42.png?resizew=501)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5e5a468fb6c9a8aaa70d45ed479913.png)
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解答题-证明题
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(0.15)
【推荐3】如图,函数y=﹣x2+bx+c的图象经过点A(m,0),B(0,n)两点,m,n分别是方程x2﹣2x﹣3=0的两个实数根,且m<n.
![](https://img.xkw.com/dksih/QBM/2021/7/13/2763113071190016/2789666510258176/STEM/c390cf7a8d14469f8d0931ee8f8cb57e.png?resizew=526)
(1)求m,n的值以及函数的解析式;
(2)设抛物线y=﹣x2+bx+c与x轴的另一个交点为C,抛物线的顶点为D,连接AB,BC,BD,CD.求证:△BCD∽△OBA;
(3)对于(1)中所求的函数y=﹣x2+bx+c,连接AD交BC于E,在对称轴上是否存在一点F,连接EF,将线段EF绕点E顺时针旋转90°,使点F恰好落在抛物线上?若存在,请求出点F的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/7/13/2763113071190016/2789666510258176/STEM/c390cf7a8d14469f8d0931ee8f8cb57e.png?resizew=526)
(1)求m,n的值以及函数的解析式;
(2)设抛物线y=﹣x2+bx+c与x轴的另一个交点为C,抛物线的顶点为D,连接AB,BC,BD,CD.求证:△BCD∽△OBA;
(3)对于(1)中所求的函数y=﹣x2+bx+c,连接AD交BC于E,在对称轴上是否存在一点F,连接EF,将线段EF绕点E顺时针旋转90°,使点F恰好落在抛物线上?若存在,请求出点F的坐标;若不存在,请说明理由.
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