【问题提出】
如图1,在矩形
中,点
在
上,且
,动点
以每秒1个单位的速度从点
出发,在折线段
上运动,连接
,当
时停止运动,过点
作
,交矩形
的边于点
,连接
.设动点
的运动路程为
,线段
与矩形
的边围成的三角形的面积为
.
【初步感知】
如图2,动点
由点
向点
运动的过程中,经探究发现
是关于
的二次函数,如图2所示,抛物线顶点
的坐标为
,与
轴的交点
的坐标为
,与
轴的交点为点
.
的边
和
的长;
【深入探究】
(2)点
由点
向终点运动的过程中,求
关于
的函数表达式;
【拓展延伸】
(3)是否存在3个路程
,
,
,当
时,3个路程对应的面积
均相等.
如图1,在矩形
![](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/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e5389296a5226b31c66f711c3e2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84756764173829ecd7d0272785c7e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
【初步感知】
如图2,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ae8510c1d3909fe6647cf3ef7846e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38849daa586e272c25dd439dde2a4442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【深入探究】
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【拓展延伸】
(3)是否存在3个路程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8544fadd14376b7ccc83c7692a614223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece8a1073b11eb11aed88ae1fc5b365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
更新时间:2024-03-30 00:05:16
|
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解题方法
【推荐1】如图1,在平面直角坐标系xOy中,有长方形OABC,其中点C坐标为
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(2)如图2,过点P作
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(3)连接BP,若
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【推荐2】平面直角坐标系
中,
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轴正半轴和
轴负半轴上,
在第二象限,满足:
,
.已知
.
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(2)求点
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(3)已知
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轴的正半轴上一点,
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,
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交
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.
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的值不变;(ii)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7209da063677db5147deae5b5049f4c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d567c6421d91dbb1eb1b3f0a5beb78ba.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
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(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
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①求证:
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②在点
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【推荐3】已知:在平面直角坐标系中,点O为坐标原点,直线y=kx+3与x轴、y轴分别交于点A、点B,且
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【推荐1】如图1,点
是线段
上与点
,点
不重合的任意一点,在
的同侧分别以
,
,
为顶点作
,其中
与
的一边分别是射线
和射线
,
的两边不在直线
上,我们规定这三个角互为等联角,点
为等联点,线段
为等联线.
个方格的纸上,小正方形的顶点为格点、边长均为1,
为端点在格点的已知线段.请用连接格点的方法,作出以线段
为等联线、某格点
为等联点的等联角,并标出等联角,保留作图痕迹;
中,
,
,延长
至点
,使
,作
的等联角
和
.将
沿
折叠,使点
落在点
处,得到
,再延长
交
的延长线于点
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并延长交
的延长线于点
,连接
.
的形状,并说明理由;
②若
,
,求等联线
和线段
的长.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f483a71f250bac98cb05d67dccad14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0936e532862712045365cb3f63fced9e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87dbb845cf98600aaf6a9a1e69ec3be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99062329fda496d31916246c0f049efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
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【推荐2】两个大小不同且都含有30°角的直角三角板按如图所示放置,将△ABC与△EDC的顶点C重合,其中∠ACB=∠DCE=90°,∠CAB=∠CED=30°.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896590329634816/2972943089082368/STEM/be97d166ffef428f852a949ab0139a46.png?resizew=359)
(1)如图1,当点E在AC上,点D在BC上时,
.求
;
(2)如图2,将△EDC绕着点C旋转一定角度时,求
;
(3)如图2,当点A,E,D在同一条直线上时,连接BD,若CD=1,BC=3,求BD.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896590329634816/2972943089082368/STEM/be97d166ffef428f852a949ab0139a46.png?resizew=359)
(1)如图1,当点E在AC上,点D在BC上时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd957c291268cfc2162ec6bfd97c0c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c0a4b9aa84adcb759e6f20d084ad0e.png)
(2)如图2,将△EDC绕着点C旋转一定角度时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1abdf990f790ed1b1ec7d481873bf2.png)
(3)如图2,当点A,E,D在同一条直线上时,连接BD,若CD=1,BC=3,求BD.
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【推荐1】如图,抛物线
(
、
为常数)经过
和
两点,其顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/9e34b37d-3ffd-4075-9836-0f6a59ce0857.png?resizew=131)
(1)求该抛物线的表达式及其顶点坐标;
(2)若点
是拋物线上第一象限的一个动点.设
的面积为
,试求
的最大值;
(3)若抛物线
与线段
有两个交点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95e84f5c91c910aaafc5e74dbfbdf59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/9e34b37d-3ffd-4075-9836-0f6a59ce0857.png?resizew=131)
(1)求该抛物线的表达式及其顶点坐标;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa856176d32063fe725ed2a8610925a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图,已知抛物线y=ax2+2x+c的顶点为A(−1,−4),与y轴交于点B,与x轴负半轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/57457a1c-4ced-4458-a4cc-9db515cc4f8f.png?resizew=130)
(1)求这条抛物线的函数关系式;
(2)点P为第三象限内抛物线上的一动点,连接BC、PC、PB,求△BCP面积的最大值,并求出此时点P的坐标;
(3)点E为抛物线上的一点,点F为x轴上的一点,若四边形ABEF为平行四边形,请直接写出所有符合条件的点E的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/57457a1c-4ced-4458-a4cc-9db515cc4f8f.png?resizew=130)
(1)求这条抛物线的函数关系式;
(2)点P为第三象限内抛物线上的一动点,连接BC、PC、PB,求△BCP面积的最大值,并求出此时点P的坐标;
(3)点E为抛物线上的一点,点F为x轴上的一点,若四边形ABEF为平行四边形,请直接写出所有符合条件的点E的坐标.
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