如图,抛物线
的对称轴为
,抛物线与x轴交于
、B两点,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/657378bd-c084-4991-84a5-85c48df2f6a9.png?resizew=134)
(1)求抛物线的解析式;
(2)点
在
下方的抛物线上,且
,求点
的坐标;
(3)在抛物线的对称轴上是否存在点P,使
是直角三角形?若存在,求出符合条件的P点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/657378bd-c084-4991-84a5-85c48df2f6a9.png?resizew=134)
(1)求抛物线的解析式;
(2)点
![](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/e5533759cc3891213030f3873154622f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)在抛物线的对称轴上是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
更新时间:2023-02-06 16:08:08
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相似题推荐
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【推荐1】已知抛物线
(a,b,c为常数).
(1)若直线l:
是抛物线的对称轴,且
.
①求抛物线与x轴的交点坐标;
②在平面直角坐标系中,点
,点
,若动点P在直线
下方的抛物线上,连结
、
,当
面积最大时,求点P坐标;
(2)若
,抛物线过点
,与y轴交于点C,将点B绕点
顺时针旋转(旋转角小于
)得到点
,当点
恰好落在抛物线上,且满足
时,求n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
(1)若直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
①求抛物线与x轴的交点坐标;
②在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685d31faa9b3bc099e4c5a11b80088f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ec64d0616c70b9ecb87d645f1962fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73be30f639b301cf797d6e8d04a568d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3991001f80af2716b605efe2d7641d8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708b59e430d74ce6e6af5ebff4a31ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881b1640911274127b9aa3d647ee903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec10ebb54ec8b8f34ea699926747f5a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccc440271f15babba34a64e95a9d9ed.png)
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【推荐2】如图,抛物线
(
)经过
三点;
(1)写出不等式
的解集;
(2)点
为第四象限内抛物线上一动点,求以
四点构成的四边形面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ba1bd16f1f4985cf9e12ad1d27d69e.png)
(1)写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95f3fa710253c107b6e8fb458108b0d.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1a5bb6df993464b16b18295de656a8.png)
![](https://img.xkw.com/dksih/QBM/2020/11/12/2591476257136640/2591628056256512/STEM/daced1ac-0594-4bc9-8c75-a97898029183.png)
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【推荐1】如图,四边形
是正方形,点E是边
上的点,连接
,
,过点D作
,垂足为F,延长
到点G,使
,连接
,
,延长
交
的延长线于点H.
(2)用含α的式子表示
;
(3)直接写出
的度数;
(4)用等式表示线段
,
,
之间的数量关系,并证明.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a447d8fc6919edd758ccec4277435aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9021f295eec76f93eadaaee5e874fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)用含α的式子表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af342d3b871ace448ccc7c648528288.png)
(3)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35adeb057595dd77b0e7cd8801183d4.png)
(4)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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名校
【推荐2】如图,菱形
的对角线
相交于点O,且
,
.
的长;
(2)点E在线段
上,且
,点F为线段
上一动点.
①当
时,求四边形
的面积;
②记
的最小值为a,
的最小值为b,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec07464a1b5bc7a2cc338b1a13e0f4a6.png)
②记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05caad72443b142c5f55efb663a6343b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ccf2c369bec99c7dd517e45aa198d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ffc1644c7029219b88232145abbdf.png)
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解答题-证明题
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【推荐1】已知抛物线
与
轴只有一个公共点,对于抛物线上的任意两点
,
,当
时,都有
,且抛物线经过点
.
(1)求证:
;
(2)将抛物线向右平移1个单位得到抛物线
,过抛物线
的顶点
的直线
与该抛物线的另一个交点为
,
为线段
上一点,过点
作
轴分别交抛物线
,
轴于点
,
,直线
交直线
于点
.
①求点
的坐标(用含
的式子表示);
②对于任意一个给定的
的值,当
的面积最大时,求证:线段
的垂直平分线过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f21a6766f5cef11a2985107f9133d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1292c47f62023b747f1a4bd615c75284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455ba3d3e46977fcbe5b71f8bb9df4be.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
(2)将抛物线向右平移1个单位得到抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8829770dd5a85c2ecaf82edea669869d.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba3aa5a21d11329906f92b2ae247432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
②对于任意一个给定的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图1,已知抛物线C经过原点,对称轴
与抛物线相交于第三象限的点M,与x轴相交于点N,且
.
![](https://img.xkw.com/dksih/QBM/2013/9/26/1573687511506944/1573687517921280/STEM/b60855d90fb3442396ecc07bad4f8db8.png)
(1)求抛物线C的解析式;
(2)将抛物线C绕原点O旋转1800得到抛物线
,抛物线
与x轴的另一交点为A,B为抛物线
上横坐标为2的点.
①若P为线段AB上一动点,PD⊥y轴于点D,求△APD面积的最大值;
②过线段OA上的两点E、F分别作x轴的垂线,交折线O-B-A于E1、F1,再分别以线段EE1、FF1为边作如图2所示的等边△AE1E2、等边△AF1F2,点E以每秒1个长度单位的速度从点O向点A运动,点F以每秒1个长度单位的速度从点A向点O运动,当△AE1E2有一边与△AF1F2的某一边在同一直线上时,求时间t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f07a770d10fa941175844e7cadccee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023e0b84be33805ba31c3cf0da0c08c1.png)
![](https://img.xkw.com/dksih/QBM/2013/9/26/1573687511506944/1573687517921280/STEM/b60855d90fb3442396ecc07bad4f8db8.png)
(1)求抛物线C的解析式;
(2)将抛物线C绕原点O旋转1800得到抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e558c8dc6ed3bf96c412a0511fab82d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e558c8dc6ed3bf96c412a0511fab82d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e558c8dc6ed3bf96c412a0511fab82d.png)
①若P为线段AB上一动点,PD⊥y轴于点D,求△APD面积的最大值;
②过线段OA上的两点E、F分别作x轴的垂线,交折线O-B-A于E1、F1,再分别以线段EE1、FF1为边作如图2所示的等边△AE1E2、等边△AF1F2,点E以每秒1个长度单位的速度从点O向点A运动,点F以每秒1个长度单位的速度从点A向点O运动,当△AE1E2有一边与△AF1F2的某一边在同一直线上时,求时间t的值.
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真题
【推荐1】如图,已知点A的坐标为(-2,0),直线
与x轴、y轴分别交于点B和点C,连接AC,顶点为D的抛物线
过A、B、C三点.
![](https://img.xkw.com/dksih/QBM/2016/8/3/1574222412587008/1574222418632704/STEM/dd6777ed-0027-4382-b5db-3c35ab425d83.png?resizew=193)
1.(1)求抛物线的解析式及顶点D的坐标;
2.(2)设抛物线的对称轴DE交线段BC于点E,P是第一象限内抛物线上一点,过点P作x轴的垂线,交线段BC于点F,若四边形DEFP为平行四边形,求点P的坐标.
3.(3)设点M是线段BC上的一动点,过点M作MN
AB,交AC于点N,点Q从点B出发,以每秒1个单位长度的速度沿线段BA向点A运动,运动时间为t(秒),当t(秒)为何值时,存在△QMN为等腰直角三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b098e17fa76c648424e9cadf558cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/2016/8/3/1574222412587008/1574222418632704/STEM/dd6777ed-0027-4382-b5db-3c35ab425d83.png?resizew=193)
1.(1)求抛物线的解析式及顶点D的坐标;
2.(2)设抛物线的对称轴DE交线段BC于点E,P是第一象限内抛物线上一点,过点P作x轴的垂线,交线段BC于点F,若四边形DEFP为平行四边形,求点P的坐标.
3.(3)设点M是线段BC上的一动点,过点M作MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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解题方法
【推荐2】如图,抛物线
与x轴交于A,B两点,与y轴交于C点,且点A(-1,0).
![](https://img.xkw.com/dksih/QBM/2020/12/26/2628810698317824/2633744200900608/STEM/55a86f51bd38491cb8cb874a5ccf6a4d.png?resizew=182)
(1)求抛物线的解析式及顶点D 的坐标;
(2)判断
的形状,并证明你的结论;
(3)点
是
轴上的一个动点,
①当
的值最小时,
;
②过点
作
轴,交抛物线于点
,连接
,
面积的最大值为 ;
(4)
为坐标轴上一点,在平面内是否存在点
,使以
为顶点的四边形为矩形?若存在,请直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad732e19306e01b065215a487f0d1ef.png)
![](https://img.xkw.com/dksih/QBM/2020/12/26/2628810698317824/2633744200900608/STEM/55a86f51bd38491cb8cb874a5ccf6a4d.png?resizew=182)
(1)求抛物线的解析式及顶点D 的坐标;
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8649ce18c628d0e03e72cef541f8284f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e586fa2dc5aba294a58f9aa53c285a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
②过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcec4050ad922c18239c38effcc45403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe1e3f36ca4a9be251487c87fa92210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555761f72a4c0698c78ca319ed6ff0c5.png)
(4)
![](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/24bd8539a984904d8c09c9263ac910d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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