题型:解答题-问答题
难度:0.85
引用次数:78
题号:21460250
如图,已知直线
与x轴交于点A,与y轴交于点C,抛物线
经过A,C两点,且与x轴的另一个交点为B,对称轴为直线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/ef3c3b19-6701-433f-930e-92226d18fa7f.png?resizew=270)
(1)求抛物线的表达式;
(2)D是第二象限内抛物线上的动点,设点D的横坐标为m,求四边形
面积S的最大值及此时D点的坐标;
(3)若点P在抛物线对称轴上,是否存在点P,Q,使以点A,C,P,Q为顶点的四边形是以
为对角线的菱形?若存在,请求出P,Q两点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5f2c447bfe1f2118a7bd65be5c6727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/ef3c3b19-6701-433f-930e-92226d18fa7f.png?resizew=270)
(1)求抛物线的表达式;
(2)D是第二象限内抛物线上的动点,设点D的横坐标为m,求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(3)若点P在抛物线对称轴上,是否存在点P,Q,使以点A,C,P,Q为顶点的四边形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
更新时间:2024-01-14 21:34:00
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【推荐1】抛物线
与x轴交于A、B两点,与y轴交于点C,点A的坐标为
,点C的坐标为
,抛物线顶点为D.
(1)求抛物线解析式;
(2)在抛物线对称轴上取一点P,使得
最短,求点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d1b0e316f658f4ffe056511101614d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f129bdbb5bc5a24440f0e0ecad6426c4.png)
(1)求抛物线解析式;
(2)在抛物线对称轴上取一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
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【推荐2】已知抛物线y=ax2+bx+c(a>0)经过A(m,n)、B(2-m,n)两点.
(1)求a、b满足的关系式;
(2)如果抛物线的顶点P在x轴上,△PAB是面积为1的直角三角形,点C是抛物线上动点(不与A、B重合),直线AC、BC分别与抛物线的对称轴交于点M、N.
①求抛物线的解析式;
②求证:PM=PN.
(1)求a、b满足的关系式;
(2)如果抛物线的顶点P在x轴上,△PAB是面积为1的直角三角形,点C是抛物线上动点(不与A、B重合),直线AC、BC分别与抛物线的对称轴交于点M、N.
①求抛物线的解析式;
②求证:PM=PN.
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【推荐1】抛物线
与y轴交点坐标是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/231031f1-9836-4c5a-9ca3-45797f9a9a48.png?resizew=226)
(1)求出m的值并画出这条抛物线;
(2)求抛物线与x轴的交点和抛物线顶点的坐标;
(3)当x取什么值时,y的值随x值的增大而减小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e913b6ab23c6dda1ee0b69350632b13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/231031f1-9836-4c5a-9ca3-45797f9a9a48.png?resizew=226)
(1)求出m的值并画出这条抛物线;
(2)求抛物线与x轴的交点和抛物线顶点的坐标;
(3)当x取什么值时,y的值随x值的增大而减小?
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【推荐2】小明在一次高尔夫球比赛中,从山坡下的O点打出一记球向山坡上的球洞A点飞去,球的飞行路线为抛物线. 如果不考虑空气阻力,当球飞行的水平距离为9米时,球达到最大水平高度为12米.已知山坡OA与水平方向的夹角为30o,O、A两点相距
米.请利用下面所给的平面直角坐标系探索下列问题:
(1)求出点A的坐标;
(2)判断小明这一杆能否把高尔夫球从O点直接打入球洞A点,并说明理由.![](https://img.xkw.com/dksih/QBM/2012/7/3/1573426623414272/1573426655993856/STEM/a660f0bad27d4a5e832245c8c34beaf0.png)
![](https://img.xkw.com/dksih/QBM/2012/7/3/1573426623414272/1573426655993856/STEM/e6385bfee18e40d4987591bdac92f8d6.png)
(1)求出点A的坐标;
(2)判断小明这一杆能否把高尔夫球从O点直接打入球洞A点,并说明理由.
![](https://img.xkw.com/dksih/QBM/2012/7/3/1573426623414272/1573426655993856/STEM/a660f0bad27d4a5e832245c8c34beaf0.png)
![](https://img.xkw.com/dksih/QBM/2012/7/3/1573426623414272/1573426655993856/STEM/e63dae94239d42ee970d25d41460aafd.png)
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【推荐1】如图,正方形
的边长为3,现将正方形
绕点C顺时针旋转
得正方形
,
,
,
,
的对应点分别为
,
,
,
.
(1)如图,当正方形
的对角线
落在
的延长线时,
与
相交于点
,连接
,则旋转角
______;
的周长=______;
(2)当旋转角
,
与
相交于点
,
,
的延长线分别与
的延长线相交于点
,
,求
的值;
(3)当旋转角
为锐角,且两个正方形重合的面积是原正方形面积的
时,直接写出旋转角α的正切值;
(4)当旋转角
,点P在直线
上,点
在射线
上,点
在与直线
的距离为2的直线上时,若以点
,
,
,
四点为顶点的四边形是菱形,直接写出菱形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e3894fe597239739df217e94715f59.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/ea33d2f5-161e-4e9e-8db2-918e825d558b.png?resizew=394)
(1)如图,当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e3894fe597239739df217e94715f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.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/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4cacd518769ce19310f5d9c6e73b86.png)
(2)当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf64643144ce16930bd20cb438b999a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ba7536b98e10c25aa2e62707db875d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b186833fb504a17b40deaf2efc5381be.png)
(3)当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(4)当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
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【推荐2】如图,
为
的直径,
为半圆上一动点,过点
作
的切线
,过点
作
,垂足为
,
与
交于点
,连接
,
,
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712403531448320/2718606478229504/STEM/db43276b-9481-4d7d-9ac2-b19206a24b96.png)
(1)求证:
;
(2)若
,连接
,
①当
______时,四边形
为菱形;
②当
______时,四边形
为正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/87320eb4a1c31ad4ffc15ccb2855a6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712403531448320/2718606478229504/STEM/db43276b-9481-4d7d-9ac2-b19206a24b96.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fca614e630d91ccd56a2dc9c5dfccc6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb4ec1afa589f245cc12fc508e886eb.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e9785a8ffb637c91757fe01d3c23a5.png)
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【推荐1】已知如图所示,直线
经过点
和
,它与抛物线
在第一象限内交于点
,且
的面积为4.
的表达式;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd4da08956db1f206c8ea026f4e52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557437a8641a61bf64c1e40f2bbf72a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】如图,二次函数的图象交
轴于
,
,交
轴于
.
(1)求这个二次函数的解析式的一般式;
(2)若点
为该二次函数图象在第四象限内一个动点,求点
运动过程中,四边形
面积的最大值,并求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be8fb59da24f78d282c87ed75d033dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abb707399e6eb6a4b44bff441ea8e69.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/e67382bf-ee17-4fc8-a27d-bd7d0fc89e02.png?resizew=137)
(1)求这个二次函数的解析式的一般式;
(2)若点
![](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/027d73939586fe24d85ccabc7e81d344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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