如图,抛物线y=x2+bx+c经过B(-1,0),D(-2,5)两点,与x轴另一交点为A,点H是线段AB上一动点,过点H的直线PQ⊥x轴,分别交直线AD、抛物线于点Q、P.
(1)求抛物线的解析式;
(2)是否存在点P,使∠APB=90°,若存在,求出点P的横坐标,若不存在,说明理由;
(3)连接BQ,一动点M从点B出发,沿线段BQ以每秒1个单位的速度运动到Q,再沿线段QD以每秒
个单位的速度运动到D后停止,当点Q的坐标是多少时,点M在整个运动过程中用时t最少?
(1)求抛物线的解析式;
(2)是否存在点P,使∠APB=90°,若存在,求出点P的横坐标,若不存在,说明理由;
(3)连接BQ,一动点M从点B出发,沿线段BQ以每秒1个单位的速度运动到Q,再沿线段QD以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2018/3/30/1913176487993344/1914838121930752/STEM/36a55c20dfa34b209421bb084426bc13.png?resizew=337)
2017·辽宁锦州·中考真题 查看更多[3]
更新时间:2017-12-12 08:49:00
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【推荐1】如图,二次函数
的图像与
轴交于点
两点,连接
,点
是抛物线上一动点,设点
的横坐标为
,过点
作直线
轴于点
,交直线
于点
.
(1)求二次函数及直线
的表达式;
(2)若点
是平面直角坐标系中一点,在点
运动的过程中,当四边形
为菱形时,求此时点
的坐标;
(3)当
时,直接写出点
的坐标..
![](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/bc17067c60b4a6a5b6d361390fedcc43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/d50a1ac8-0300-4afb-ae01-6f943b47e130.png?resizew=144)
(1)求二次函数及直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963731fbdd29638642f58d81309541dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aded792b4c13a742e768f46f8c3c3204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】当抛物线
(a、b、c为常数,c≠0)与x轴交于A,B两点时,以AB为边作矩形ABCD,使点C、点D落在直线y=c上,我们把这样的矩形ABCD叫做该抛物线的“相约矩形”.
(1)①抛物线
的“相约矩形”的周长为___________.
②当抛物线
(c为常数)不存在“相约矩形”,则c的取值范围是_________.
(2)已知抛物线
经过点(2,0),当该抛物线的“相约矩形”是正方形时,求出该抛物线所对应的函数表达式.
(3)对于函数
(a为常数).
①当该函数的图象与x轴只有-个交点时,求出交点的坐标;
②我们把平面直角坐标系中横、纵坐标都为整数的点称为“好点”,当抛物线
(a为常数,a>0)的“相约矩形”内部(包括矩形边界)恰有8个“好点”时,直接写出a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(1)①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d794141572c8b1e70957754f32b9eb.png)
②当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f09b500a60ed3a5d28eca9546b5de2.png)
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
(3)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c20d7092a1fd33523a26d445e8b22f.png)
①当该函数的图象与x轴只有-个交点时,求出交点的坐标;
②我们把平面直角坐标系中横、纵坐标都为整数的点称为“好点”,当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c20d7092a1fd33523a26d445e8b22f.png)
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【推荐1】等腰
中,
,过点
作
于点
,平面上有一点
,连接
,
,
,作
的角平分线交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/1b70b27c-44c7-4154-acd2-d3035b6a6a0b.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/8cc4effd-3a1b-4a57-80dd-2c949c348f83.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/44094453-f959-49fa-acfa-c41c149f1156.png)
(1)图1,当
时,若
,
,求线段
的长;
(2)如图2,当
时,过点
作
,分别交
,
于点
,
,若
,
为
中点,连接
,求证:
;
(3)如图3,在(1)的条件下,
上取点
,
,点
,
为线段
上的两个动点(点
在点
的左侧),连接
,将
绕点
逆时针旋转得到
,若满足
于点
,连接
,
,当
的值最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff85c444ade8b57a404648931758882.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/1b70b27c-44c7-4154-acd2-d3035b6a6a0b.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/8cc4effd-3a1b-4a57-80dd-2c949c348f83.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740507770454016/2745384402837504/STEM/44094453-f959-49fa-acfa-c41c149f1156.png)
(1)图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef95ebb3e3e81f72c609203f0a046a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fd76d8997e3b2db7d9cb9b72d0f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20602be3cee0c04ff9caec35cab0887c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce1335e489c2b0835d7e16ea765e1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669588427e89b121321b8e68e16785c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6e6bc6f515f5c96b4a7d9700d6a9d4.png)
(3)如图3,在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e4fca74089a2c6007f208d120823c6.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/d40b319212a7e7528b053e1c7097e966.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/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20d576d3824eaf583c67809124c6327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8111faae0aee5d9edca9d8c2aaa3b4f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7251abd9e38d703d072ad69d13b1794e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa29dabe92ca337f7aa128245d58d720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56b0348213284a19e2acc5a088fa491.png)
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【推荐2】如图,直线
与x轴交于A,与y轴交于B,抛物线
经过点A,且与y轴交于点C(0,4),P为x轴上一动点,按逆时针方向作∆CPE,使∆CPE∽∆AOB.
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505610374447104/2507020798894080/STEM/f184f758-e00a-4a80-af0f-bcc9c87c91eb.png?resizew=179)
(1)求抛物线解析式.
(2)若点E落在抛物线上,求出点P的坐标.
(3)若∆ABE是直角三角形,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505610374447104/2507020798894080/STEM/f184f758-e00a-4a80-af0f-bcc9c87c91eb.png?resizew=179)
(1)求抛物线解析式.
(2)若点E落在抛物线上,求出点P的坐标.
(3)若∆ABE是直角三角形,直接写出点P的坐标.
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【推荐1】已知抛物线y=ax2+bx−
(a>0)与x轴交于点A,B两点,OA<OB,AB=4.其顶点C的横坐标为-1.
(1)求该抛物线的解析式;
(2)设点D在抛物线第一象限的图象上,
垂足为E,DF∥y轴交直线AC于点F,当
面积等于4时,求点D的坐标;
(3)在(2)的条件下,点M是抛物线上的一点,M点从点B运动到达点C,
交直线BD于点N,延长MF与线段DE的延长线交于点H,点P为N,F,H三点构成的三角形的外心,求点P经过的路线长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)求该抛物线的解析式;
(2)设点D在抛物线第一象限的图象上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)在(2)的条件下,点M是抛物线上的一点,M点从点B运动到达点C,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb333b87ab3ecde430010b4dd8b371fc.png)
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【推荐2】对于点
,
和图形
,给出如下定义:如果图形
上存在一点
,使
,
,则称点
为点
关于图形
的一个“旋垂点”,
的长称为“垂距”.在平面直角坐标系
中:
(1)已知点
,
,
①在点
,
,
中,点
关于点
的“旋垂点”是__________;
②若点
是点
关于线段
的“旋垂点”,求点
的横坐标
的取值范围;
(2)
的圆心为
,半径为
,直线
与
轴,
轴分别交于
,
两点,若在
上存在点
,使得点
关于
的一个“旋垂点”在线段
上存在,且“垂距”为
,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bd8a886240fc1827ed9ed6e5e7e76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5257b41435c504aea5d65a5c62d081a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baca988e757625c577e02752422a72d.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eeb7d7eb85e3ae9629d518579add3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f044d5998c45f984b4fb0ec41b0a2a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5af31334ede3ec659e01dcb8bda52e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c22f4b5c09a56bd63d8378365fbdbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758080793e3ca0b8166f840475434aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
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解答题-问答题
|
困难
(0.15)
【推荐1】已知抛物线
与
轴交于
,
两点(点
在点
的左侧),与
轴交于点
.点
是点
关于抛物线对称轴的对称点.过
,
两点的直线与
轴交于点
.
(Ⅰ)求
,
两点的坐标;
(Ⅱ)若点
是抛物线上的点,点
的横坐标为
,过点
作
轴,垂足为
.线段
与直线
交于点
,当
时,求点
的坐标;
(Ⅲ)若点
是
轴上的点,且满足
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0116aca690b431a7b75627d8464e2260.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅱ)若点
![](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/ce3424b3a6f9f76f23f111b4eef5d968.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2652ad774be4d1a32f4eb6e2b6a21a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(Ⅲ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7b33b3e2dbfe5e4175757fd7053469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解答题-问答题
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困难
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真题
【推荐2】如图1所示,已知直线
与x轴、y轴分别交于A、C两点,抛物线
经过A、C两点,点B是抛物线与x轴的另一个交点,当
时,y取最大值
.
![](https://img.xkw.com/dksih/QBM/2013/7/29/1573673096806400/1573673102467072/STEM/c9b3b3d9-bb22-4de7-ab5b-08f09c85b8d3.png?resizew=236)
(1)求抛物线和直线的解析式;
(2)设点P是直线AC上一点,且
,求点P的坐标;
(3)若直线
与(1)中所求的抛物线交于M、N两点,问:
①是否存在a的值,使得∠MON=90°?若存在,求出a的值;若不存在,请说明理由;
②猜想当∠MON>90°时,a的取值范围(不写过程,直接写结论).
(参考公式:在平面直角坐标系中,若M(x1,y1),N(x2,y2),则M,N两点间的距离为
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6c4a684e08d7a47b544929c449c054.png)
![](https://img.xkw.com/dksih/QBM/2013/7/29/1573673096806400/1573673102467072/STEM/c9b3b3d9-bb22-4de7-ab5b-08f09c85b8d3.png?resizew=236)
(1)求抛物线和直线的解析式;
(2)设点P是直线AC上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5f3f41642c5ca0446cd67a88fd42bf.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a16a128d07b4d4232f79d013c14ad2.png)
①是否存在a的值,使得∠MON=90°?若存在,求出a的值;若不存在,请说明理由;
②猜想当∠MON>90°时,a的取值范围(不写过程,直接写结论).
(参考公式:在平面直角坐标系中,若M(x1,y1),N(x2,y2),则M,N两点间的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1549416c93fce2ac501fc865dfb06.png)
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