如图,抛物线y=ax2+bx+3(a≠0)与x轴交于点A(1,0)和点B(-3,0),与y轴交于点C,连接BC,与抛物线的对称轴交于点E,顶点为点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b9394dd1-93f8-4be2-9702-b8d641bc1b72.png?resizew=394)
(1)求抛物线的解析式;
(2)若M是抛物线上位于线段BC上方的一个动点,求△BCM的面积的最大值;
(3)点P是对称轴左侧抛物线上的一个动点,点Q在射线ED上,若以点P、Q、E为顶点的三角形与△BOC相似,请直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b9394dd1-93f8-4be2-9702-b8d641bc1b72.png?resizew=394)
(1)求抛物线的解析式;
(2)若M是抛物线上位于线段BC上方的一个动点,求△BCM的面积的最大值;
(3)点P是对称轴左侧抛物线上的一个动点,点Q在射线ED上,若以点P、Q、E为顶点的三角形与△BOC相似,请直接写出点P的坐标.
更新时间:2022-08-03 17:45:23
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相似题推荐
解答题-问答题
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真题
解题方法
【推荐1】已知抛物线
经过点(0,2),且与
轴交于A、B两点.设k是抛物线
与
轴交点的横坐标;M是抛物线
的点,常数m>0,S为△ABM的面积.已知使S=m成立的点M恰好有三个,设T为这三个点的纵坐标的和.
(1)求c的值;
(2)直接写出T的值;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd45d429d80a83eea13b863fac7f782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd45d429d80a83eea13b863fac7f782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd45d429d80a83eea13b863fac7f782.png)
(1)求c的值;
(2)直接写出T的值;
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d39950e9c0c7bd88fdba4c5f8cc11f.png)
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【推荐2】已知抛物线
顶点
,经过点
,且与直线
交于
,
两点.
(1)求抛物线的解析式;
(2)若在抛物线上恰好存在三点
,满足
,求
的值;
(3)在
,
之间的抛物线弧上是否存在点
满足
?若存在,求点
的横坐标;若不存在,请说明理由.(坐标平面内两点
之间的距离
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec044e255cd96512cf7a94b8b4a6278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fe63002e62d263a103a82823323147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79354e7611fa1bf6cccb4a0ec34ae84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求抛物线的解析式;
(2)若在抛物线上恰好存在三点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41c7f947057ec5e3bf3c7e59c305c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b8b9e8a7b171a6e25ead4289e32f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)在
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe43e5b7d805a3ea3907aed1fb0e8bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a598a60ceec5613923400ea330db5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69099992d53dabe828069e22640a6058.png)
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【推荐1】已知正方形
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/2019/7/8/2242464070524928/2243982964039680/STEM/032a64c8b8cc4339beaf6f0f63860606.png?resizew=344)
(1)如图1,点
为线段
上的一点,且
,延长
、
分别与边
、
交于点
、
.
①求证:
;
②求证:
.
(2)如图2,在边
上取一点
,满足
,连结
交
于点
,连结
并延长交
于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2019/7/8/2242464070524928/2243982964039680/STEM/032a64c8b8cc4339beaf6f0f63860606.png?resizew=344)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a51ed1fa725fd483e7379e614a9bc85.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105931824e57054dbfa2a03eefe9c9d1.png)
(2)如图2,在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105931824e57054dbfa2a03eefe9c9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.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/21e096e5531420db170acbec684aafb7.png)
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【推荐2】如图1,
是圆O的直径,点C在圆O上,点D是
的中点,
,
的延长线交于点E,
为圆O的切线,交
于点F,
.
;
(2)若
,设
,
,求
;
(3)如图2,延长
与
交于点N,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310072f43103d05c1a31658abbb116b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81c0b03202d7dbaf766b8d051b4fc5b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc129cb36c3a4f17e310de23d504e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c412bc386f54c93ae1fb4efb85df5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68de940e95d2323fc7a9a74618dcae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
(3)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc0fb5834e0c5255b36d9da412f5ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐1】综合与探究
如图,抛物线
经过点
,
,与
轴交于另一点
(点
在点
的右侧),点
是第四象限内抛物线上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6afd286f-a186-445d-9539-35a2caf4b09d.png?resizew=111)
(1)求抛物线的函数解析式及点
的坐标;
(2)若
的面积为
,请直接写出
关于
的函数关系表达式,并求出当
的值为多少时,
的值最大?最大值为多少?
(3)是否存在点
,使得
?若存在,求出点
的坐标;若不存在,请说明理由.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a15e67fdb7a31db934cf11341894b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c84818cfbd9a885081cb4e3294eabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6afd286f-a186-445d-9539-35a2caf4b09d.png?resizew=111)
(1)求抛物线的函数解析式及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdf79ad54602f30fe55e96b93bcff24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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名校
【推荐2】如图,抛物线
与
轴交于点
,与
轴交于点A、
,点A坐标为
.
(1)求该抛物线的解析式;
(2)抛物线的顶点为
,在
轴上找一点
,使
最小,并求出点
的坐标;
(3)点
是线段
上的动点,过点
作
,交
于点
,连接
.当
的面积最大时,求点
的坐标;
(4)若平行于
轴的动直线
与该抛物线交于点
,与直线
交于点
,点
的坐标为
.问:是否存在这样的直线
,使得
是等腰三角形?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b4c83fea9583fcebeb66b5608c666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73b1829c0349695098f487dc474df2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff97b2c7c092e2b27cc5caaeb3ad5993.png)
(1)求该抛物线的解析式;
(2)抛物线的顶点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfaa5c4832a7cfd3978079d0715c0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/5aded35d749aee8233fb2ae4241dfa87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86643348a8164750d9aefcfe20fecb7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(4)若平行于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/f3b2ab55487cf5e7b89926a6406c9ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f239a35de1828b14a58be5bd5af9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2018/9/19/2035787738554368/2036324107722752/STEM/716a7548b619492b8e490e270d38f7db.png?resizew=443)
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【推荐1】如图,在平面直角坐标系
中,抛物线
与
轴交于
,B两点(点
在点
左侧),与
轴交于点
,点
为
轴下方拋物线上一点;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/68e1b867-a030-44f0-9cfb-af3b4e541cfc.png?resizew=403)
(1)求抛物线的解析式;
(2)如图1,当点
横坐标为2时,
为直线
上一点,
的周长为7是否成立,若成立,请求出
点坐标,若不成立,请说明理由;
(3)若直线
与
轴交于点
,直线
与抛物线交于点
,连接
与
轴交于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.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/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/68e1b867-a030-44f0-9cfb-af3b4e541cfc.png?resizew=403)
(1)求抛物线的解析式;
(2)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e109a9e42361f1dd54861a741b97f196.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图1,抛物线y=ax2+bx+3过A(1,0)、B(3,0)两点,交y轴于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/4942d869-62d6-48fb-90fb-e5e91f95f3a8.png?resizew=317)
(1)求抛物线的函数解析式;
(2)在抛物线的对称轴上是否存在点M,使△ACM的周长最小?若存在,求出△ACM周长的最小值;若不存在,请说明理由.
(3)如图2,连接BC,抛物线上是否存在一点P,使得∠BCP=∠ACB?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/4942d869-62d6-48fb-90fb-e5e91f95f3a8.png?resizew=317)
(1)求抛物线的函数解析式;
(2)在抛物线的对称轴上是否存在点M,使△ACM的周长最小?若存在,求出△ACM周长的最小值;若不存在,请说明理由.
(3)如图2,连接BC,抛物线上是否存在一点P,使得∠BCP=∠ACB?若存在,求出点P的坐标;若不存在,请说明理由.
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