如图,对称轴为直线x=﹣1的抛物线y=a(x﹣h)2+k(a≠0)图象与x轴交于点A、B(点A在点B的左侧),与y轴交于点C,其中点B的坐标为(2,0),点C的坐标为(0,4).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/3f17551e-cb01-4d17-a490-ecba94faaf70.png?resizew=505)
(1)求该抛物线的解析式:
(2)如图1,若点P为抛物线上第二象限内的一个动点,点M为线段CO上一动点,当△APC的面积最大时,求△APM周长最小值;
(3)如图2,将原抛物线绕点A旋转180°,得新抛物线y',在新抛物线)y'的对称轴上是否存在点Q使得△ACQ为等腰三角形?若存在,请直接写出点Q的坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/3f17551e-cb01-4d17-a490-ecba94faaf70.png?resizew=505)
(1)求该抛物线的解析式:
(2)如图1,若点P为抛物线上第二象限内的一个动点,点M为线段CO上一动点,当△APC的面积最大时,求△APM周长最小值;
(3)如图2,将原抛物线绕点A旋转180°,得新抛物线y',在新抛物线)y'的对称轴上是否存在点Q使得△ACQ为等腰三角形?若存在,请直接写出点Q的坐标;若不存在,说明理由.
21-22九年级下·重庆·开学考试 查看更多[11]
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更新时间:2022-03-06 23:05:08
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相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,抛物线
顶点为坐标原点
、且经过点
,直线经过点
和点
.
(2)如果将此抛物线平移,平移后新抛物线的顶点
在原抛物线上,新抛物线的对称轴与直线
在原抛物线的内部相交于点
,且
,求新抛物线的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ec64d0616c70b9ecb87d645f1962fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86acf63b2b7c89ccb8c47244b325f273.png)
(2)如果将此抛物线平移,平移后新抛物线的顶点
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51630723c81c43652cac2d31c6f4a16.png)
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【推荐2】如图,抛物线
与
轴交于
,
两点,与
轴交于点
,已知点
坐标为
,点
坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/5b6f1585-4189-4270-a2fb-8c45e16d8984.png?resizew=214)
(1)求抛物线的解析式;
(2)若
点为直线
上方抛物线上的一个动点,存不存在点
,使得
?若存在,求出
点坐标;若不存在,请说明理由.
![](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/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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/5b6f1585-4189-4270-a2fb-8c45e16d8984.png?resizew=214)
(1)求抛物线的解析式;
(2)若
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9548ec06fe083d76a8e9091cc86e0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】(1)如图1,在
中,点
分别在
上,且
,
交
于点
,求证:
;
(2)如图,
中,
,正方形
的四个顶点在
的边上,连接
分别交
于
两点.
①如图2,若
,直接写出
的长;
②如图3,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91420e371485621e7ef7f81d8794de2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504f0c0547a40bdbd23769f01e34a547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98651c89c432f1f45c43fd45b6b5422c.png)
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8135003f6cfb43605ce5c5533469a6c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②如图3,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfaf163b2da8fdf3cfebed157c5a034a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/9a93f448-76c8-4ccc-8199-ac232d05cf8e.png?resizew=683)
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【推荐2】如图,在四边形
中,
,
,AD=10cm,BC=8cm,CD=16cm.点
从点
出发,以每秒3cm的速度在线段
运动,点
从点
出发,以每秒2cm的速度沿线段
方向向点
运动.已知动点
,
同时出发,设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722813483409408/2790790113132544/STEM/ebdd67ac-83e7-4257-8e64-7621ae0a76c2.png)
(1)求
的长;
(2)当四边形
为平行四边形时,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bce559fceb4731f8d4323410075a22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722813483409408/2790790113132544/STEM/ebdd67ac-83e7-4257-8e64-7621ae0a76c2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42d53a48595e6f0be79d75a12938e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42d53a48595e6f0be79d75a12938e89.png)
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【推荐3】我们定义:若一个三角形最大边上的点将该边分为两条线段,且这两条线段的积等于这个点到最大边所对顶点连线的平方,则称这个点为这个三角形的“比例中点”.例如:如图1,已知钝角
中,
是钝角,点
是
上的一点,连接
,若
,则称点
是
的“比例中点”.
的坐标为
,点
在
轴上,
,若点
是
的“比例中点”,则点
的坐标为______;
(2)如图3,已知
中,
,
,
,若点
是
的“比例中点”,求
;
(3)如图4,已知
是等边三角形,因为等边三角形的三边相等,所以其中任意一条边都可以看成最大边,试判断等边三角形有没有“比例中点”?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/46887681820d8e486bcb1a0d7c051bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.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/d572eb3233343b90f190dde56701f22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4f7c2df7b4f88665e7b00cb7a9fa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3568f51bde4e391c8f08ff3d55989aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)如图4,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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名校
【推荐1】已知
,
,
,
为
上的一点.
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/cb8a34ff-f891-4320-8fb8-20969046f716.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/c894b6c7-9dd9-4f3e-a892-4feb1f7bfa7c.png?resizew=225)
(1)如图1,若
,
,求
的长;
(2)如图2,过点
作
垂直
的平分线于点
,过点
作
交
的延长线于点
,连接
交
于点
,若
平分
,
.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/cb8a34ff-f891-4320-8fb8-20969046f716.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/c894b6c7-9dd9-4f3e-a892-4feb1f7bfa7c.png?resizew=225)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0429144beed02061116993d1d6f10d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8511eeface9029eeaeaf60ec2c722d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e41916523511064a97de39b0f2b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0573e4ac3ffa74064a17777ce7ffbcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c726e6761220da38a3f2f20bd60a91f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e00851620016f8548970ef93ebd879.png)
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【推荐2】含30°角的直角三角板
中,
.将其绕直角顶点C顺时针旋转
角(
),得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
,边
与边
交于点D,过点 D作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
交
边于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
边经过点B时,求
的度数;
(2)小明发现在三角板旋转的过程中,
度数是定值,他在探究过程中需证明:
.
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
度数的范围;
(3)设
的面积为S,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
时,求
的长,以点
为圆心,
为半径作
,并判断此时直线
与
的位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3103a9141008afb6dff5564ee58f8be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e477724e91fad6273eb151496a6e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)小明发现在三角板旋转的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd519bfe47895e5ed56e834039353e4a.png)
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d713d6649c9b42283b1a0b83ba34cc56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda95fdeb2571aab2e1d645efa65b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
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【推荐3】某数学兴趣小组对具有公共顶点,且其中某个角等于大角一半的几何图形中,边与边之间的数量关系进行了如下探索:
初步探索
(1)如图
,
,
分别是正方形
的
边和
边上的点,并且
,我们可通过如下方法探索
与
和
之间的数量关系:
因为
,
,所以我们以点
为旋转中心,将
绕点
顺时针旋转
,使得点
与点
重合,则点
的对应点恰好落在
的延长线上,记为点
,由
且易证
,从而可知,
,
,
的数量关系是______.
探索延伸
(2)如图
,
,
是等腰直角
的底边
上的点,
,(1)中的结论是否仍然成立?若成立,给出证明;若不成立,写出新的结论,并说明理由.
拓展应用
(3)如图
,在矩形
中,
是
边的三等分点,
为
边上的点,且
,当
,
时,直接写出
的长.
初步探索
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a16e45ea2fabc5e37c5604a95fb9c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592849d99e570c23906687097b1072ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9ddf5508b952f05eabb8723ef3755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3f8b15597d87417d5da1ff09aeb38d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
探索延伸
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
拓展应用
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/815e7a99-3197-431d-ba82-3ca32176f666.png?resizew=584)
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解题方法
【推荐1】如图所示,抛物线y=ax2+bx﹣3与x轴交于A(﹣1,0),B(3,0)两点,与y轴交于点C,点M是抛物线的顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/cf8a39bc-96f0-45ad-bacc-a217058b2aff.png?resizew=167)
(1)求抛物线的解析式及顶点M的坐标;
(2)如图,直线BC下方的抛物线上有一点D,过点D作DE⊥BC于点E,作DF平行x轴交直线BC于点F,求△DEF周长的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/cf8a39bc-96f0-45ad-bacc-a217058b2aff.png?resizew=167)
(1)求抛物线的解析式及顶点M的坐标;
(2)如图,直线BC下方的抛物线上有一点D,过点D作DE⊥BC于点E,作DF平行x轴交直线BC于点F,求△DEF周长的最大值.
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【推荐2】如图,在平面直角坐标系中,抛物线
与x轴分别交于点A、点B,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/50144465-a1cb-473f-8e77-f6c44473d213.png?resizew=532)
(1)如图1,连接
,直接写出
的值;
(2)如图2,连接
.点
在抛物线上,连接
,若异于点G的点H也在抛物线上,且
,求点H的坐标;
(3)如图3,若直线
与抛物线交于点P、Q,连接
交y轴正半轴于点M,连接
交y轴负半轴于点N,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7adf7d8633d28a374782ed1b67dcfadc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/50144465-a1cb-473f-8e77-f6c44473d213.png?resizew=532)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d601e6648f9dc2178991d2197cf1056b.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68487783a7d0bc44f22db536087ec998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a909a9b38bac40762e092c1b43dda463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d95262e0b20f5d48c125252a40c592.png)
(3)如图3,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c1972246a0a3d1c987d25205dbdd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853a7d24a0f2005ce73a8ddb4942e693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4a7a7b5944c122af3ed4379c2de229.png)
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