如图,抛物线y=ax2+2x+c经过点A(0,3),B(﹣1,0),请解答下列问题:
(1)求抛物线的解析式;
(2)抛物线的顶点为点D,对称轴与x轴交于点E,连接BD,求BD的长;
(3)点F在抛物线上运动,是否存在点F,使△BFC的面积为6,如果存在,求出点F的坐标;如果不存在,请说明理由.
(1)求抛物线的解析式;
(2)抛物线的顶点为点D,对称轴与x轴交于点E,连接BD,求BD的长;
(3)点F在抛物线上运动,是否存在点F,使△BFC的面积为6,如果存在,求出点F的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/12/13/2354144784064512/2355618402664448/STEM/27d922de4730498abe7de07ad9ffa36b.png?resizew=155)
更新时间:2019-12-15 13:00:49
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【推荐1】在平面直角坐标系中,抛物线
经过
、
.已知点
,
,
,其中点
在
轴下方,当
不重合时,以
、
为边作矩形
.
(1)求抛物线的解析式;
(2)点
在抛物线上时,求点
的坐标;
(3)当矩形
与抛物线在点
之间部分图象(包括端点)恰好有两个公共点时,直接写出
的取值范围;
(4)点
为直线
与抛物线对称轴的交点,设矩形
关于点
的对称图形为矩形
,当两个矩形的边与抛物线共有不少于两个交点,且交点中最高点与最低点的纵坐标之差为1时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f880f02c51a46e883522368a40ed66df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8728cbf5da0dbd4832ff16d91afcd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaa9b854e4fced698aef06272d8eeec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6848fee732b73643dceb16c7048f123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9d9c0e0335c340c047f4c13ddebc29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(1)求抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)当矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98ab6231615163f2d36a84349546e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图1,已知在平面直角坐标系xOy中,点A、B、C分别为坐标轴上的三个点,且OA=1,OB=3,OC=3.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929105270726656/3062626975105024/STEM/bcf606b53d6c4aa0843d41074e8019dc.png?resizew=349)
(1)求经过A、B、C三点的抛物线的解析式;
(2)点M是抛物线上一个动点,且在直线BC的上方,连接MO、MB,并把△MOB沿BO翻折,得到四边形MOM'B,那么是否存在点,使四边形MOM'B为菱形?若存在,请求出此时点M的坐标;若不存在,请说明理由;
(3)如图2,过抛物线顶点D作直线DE∥y轴,交x轴于点E,点P是抛物线上A、D两点间的一个动点(点P不与A、D两点重合),直线PC、PA与直线DE分别交于点F、G,当点P运动时,EF+EG是否为定值?若是,试求出该定值;若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929105270726656/3062626975105024/STEM/bcf606b53d6c4aa0843d41074e8019dc.png?resizew=349)
(1)求经过A、B、C三点的抛物线的解析式;
(2)点M是抛物线上一个动点,且在直线BC的上方,连接MO、MB,并把△MOB沿BO翻折,得到四边形MOM'B,那么是否存在点,使四边形MOM'B为菱形?若存在,请求出此时点M的坐标;若不存在,请说明理由;
(3)如图2,过抛物线顶点D作直线DE∥y轴,交x轴于点E,点P是抛物线上A、D两点间的一个动点(点P不与A、D两点重合),直线PC、PA与直线DE分别交于点F、G,当点P运动时,EF+EG是否为定值?若是,试求出该定值;若不是,请说明理由.
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解题方法
【推荐1】如图,以
的斜边AC为直径作
,点D在半径OC上,过点D作AC的垂线,分别交弦BC于点E,交
于F.在射线DE上取点G,连接GB并延长交CA的延长线于点H,且满足
.
(1)求证:HG是
的切线;
(2)若
.
(i)求
的半径;
(ii)如图2,连接AF,交弦BC于点M,若
,求线段OD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f92cf3b0b3367c8468b7b23245a.png)
(1)求证:HG是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa966259be985c48e40005f213c9af7f.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(ii)如图2,连接AF,交弦BC于点M,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6e8a642590e05105eebf986e755e1f.png)
![](https://img.xkw.com/dksih/QBM/2021/4/30/2711052745416704/2712489126338560/STEM/9bdba4b1-9114-45c2-90e9-d93d27c19edf.png?resizew=529)
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【推荐2】如图,在矩形
中,
,
,点
,
分别在边
,
上,
,连接
,
.动点
在
上从点
向终点
匀速运动,同时,动点
在射线
.上从点
沿
方向匀速运动,当点
运动到EF的中点时,点
恰好与点
重合,点
到达终点时,
,
同时停止运动.
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230410477568/2446444641861632/STEM/9d1283d7970748039af81e4c5a175456.png?resizew=444)
(1)求
的长.
(2)设
,
,求
关于
的函数表达式,并写出自变
的取值范围.
(3)连接
,当
与
的一边平行时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230410477568/2446444641861632/STEM/9d1283d7970748039af81e4c5a175456.png?resizew=444)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cec6917c6eb4ecff6b6dbc8ab4f73fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be99a73b1607c63b9a82cfa00b81bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
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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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解题方法
【推荐2】二次函数
的图像与
轴交于
,
两点,与
轴交于点
,顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/26/d0137623-7769-4257-bf73-0a274fa75f70.png?resizew=639)
(1)二次函数的表达式为________,点
的坐标为_________;
(2)如图①,
是该二次函数图像的对称轴上一个动点,当
的垂直平分线恰好经过点
时,求点
的坐标;
(3)如图②,
是直线
上方的二次函数图像上的一个动点,连接
,取
中点
,连接
,
,
,当
的面积为
时,求点
的坐标.
(4)连接
,
是平面内一点,将
绕点
沿逆时针方向旋转
后,得到
,点
、
、
的对应点分别是点
、
、
.若
的
、
两个顶点恰好落在抛物线上,请直接写出点
的横坐标.
![](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/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbdef5d0c05acbf63fa72fa85c5bb45.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/26/d0137623-7769-4257-bf73-0a274fa75f70.png?resizew=639)
(1)二次函数的表达式为________,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7086e8d3bd8849157f34777645bf32d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
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