如图,已知抛物线
=
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/7cb27f0a-8b5b-41e6-8037-1981d369105a.png?resizew=201)
(1)求抛物线的解析式及顶点
坐标;
(2)在抛物线的对称轴上找到点
,使得
的周长最小,并求出点
的坐标;
(3)在(2)的条件下,若点
是线段
上的一个动点(不与点
、
重合).过点
作
交
轴于点
.设
的长为
,问当
取何值时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8eda7d31384ce72fd08b3e8b777dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9481b67ea102a544992799be370d9998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3031557cd6148d383cddcf977d82ca52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2db885ad7da56625153d3bceafdb507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8ec02248b92cc0f38855fa495cc9be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/7cb27f0a-8b5b-41e6-8037-1981d369105a.png?resizew=201)
(1)求抛物线的解析式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f1796428c2600bbbdff746b0311583.png)
(2)在抛物线的对称轴上找到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680965a7970b9b71e160393b504af31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7909220d1db380634534190b662ee0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93817f9341592f0626b02c78b65ccdf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b2a8c80bc574fc27cb32dcb06c6679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7909220d1db380634534190b662ee0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3223768268777a300ef781a23a568c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9af8c3fbdb748fd11e2423de063616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c59076e80b15755ef630fd5f40d1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc2730277cbe81789d071e235bc9315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022abc6afd4deff13845419fa38312e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022abc6afd4deff13845419fa38312e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3946c5f9963fd16e6eae5b0e923c119.png)
更新时间:2020-05-15 19:36:25
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相似题推荐
解答题-问答题
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困难
(0.15)
【推荐1】如图,抛物线与
轴交于
,
两点,点
在点
的左边,与
轴交于点
,点
是抛物线的顶点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/13b4ae8e-bf88-450c-bbb5-aa10e1678cdb.png?resizew=134)
(1)求抛物线的解析式;
(2)点
是直线
下方的抛物线上一动点,不与点
,
重合,过点
作
轴的垂线交
于点
,求
面积的最大值及此时
点坐标;
(3)在抛物线的对称轴上是否存在点
,使得
为直角三角形?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834f8ca2e7bad3ef604edbda316f9404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6688379b4ea2a9b4204eb3799a4fa285.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/13b4ae8e-bf88-450c-bbb5-aa10e1678cdb.png?resizew=134)
(1)求抛物线的解析式;
(2)点
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b280088a8f97b52c2145bc709434e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在抛物线的对称轴上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0288f5a9e234c0fc858c89f0a30c003b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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名校
【推荐2】如图,在平面直角坐标系
中,抛物线
经过点
,点B在y轴上,直线
与抛物线在第四象限交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/da756a6f-c194-4231-a692-ff45957ef3cb.png?resizew=283)
(1)求抛物线的解析式;
(2)点P在抛物线上,若使得
的点P恰好只有三个,求a的值;
(3)请使用圆规和无刻度直尺,在图2的抛物线上确定满足条件的点D,使得
,并说明理由(保留作图痕迹,不写作法).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a11bc720db9592604593bd627395ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc3341314fc6ce2699f31471021df53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c070ba2b4bb7e901846696ccf8125c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/da756a6f-c194-4231-a692-ff45957ef3cb.png?resizew=283)
(1)求抛物线的解析式;
(2)点P在抛物线上,若使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea457446df23265c66e211c7a5c90358.png)
(3)请使用圆规和无刻度直尺,在图2的抛物线上确定满足条件的点D,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2069f820c6ca1a916f373677a17aff1c.png)
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【推荐1】【解决问题】如图①,在四边形
中,
,点
是边
的中点,
,求证:
平分
.
提示:延长
交射线
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbc619df1eee56ff0d8d4792f9c9f3d.png)
【应用】如图②,在矩形
中,点
是边
上的一点,将
沿直线
折叠,若点
落在边
的中点
处,则
______.
【拓展】在矩形
中,
,点
为边
的中点,将
沿直线
折叠,得到
,延长
交直线
于点
,直线
交边
于点
若
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b5ea5627440c19999a9039eaa1c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f135ae4531e59a3c5a7c1e475a5e8934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e816627ed986ee824a52e94c76880015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbc619df1eee56ff0d8d4792f9c9f3d.png)
【应用】如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8deae0ab9e7ed4863f73b1347cd73c26.png)
【拓展】在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7654b4dbc0f9ba23055f4cb65560a223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa4ecbe57994125c6d4cf3b272c5e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21093eae7765f54a8de66750a63e1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b20cd1a43264e4533d4980c99fdad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/ef154fe7-1369-43b7-8710-8a5ddc508a2c.png?resizew=337)
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真题
【推荐2】已知抛物线y=ax2+bx+c经过A(﹣1,0)、B(2,0)、C(0,2)三点.
(1)求这条抛物线的解析式;
(2)如图一,点P是第一象限内此抛物线上的一个动点,当点P运动到什么位置时,四边形ABPC的面积最大?求出此时点P的坐标;
(3)如图二,设线段AC的垂直平分线交x轴于点E,垂足为D,M为抛物线的顶点,那么在直线DE上是否存在一点G,使△CMG的周长最小?若存在,请求出点G的坐标;若不存在,请说明理由.
(1)求这条抛物线的解析式;
(2)如图一,点P是第一象限内此抛物线上的一个动点,当点P运动到什么位置时,四边形ABPC的面积最大?求出此时点P的坐标;
(3)如图二,设线段AC的垂直平分线交x轴于点E,垂足为D,M为抛物线的顶点,那么在直线DE上是否存在一点G,使△CMG的周长最小?若存在,请求出点G的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2014/8/11/1573743572115456/1573743578505216/STEM/4f233d91360645cbb1436382b716823d.png)
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【推荐3】阅读下列材料:
已知:如图1,在Rt△ABC中,∠C=90°,AC=4,BC=3,P为AC边上的一动点,以PB,PA为边构造□APBQ,求对角线PQ的最小值及此时
的值是多少.
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748021501952/1573748027564032/STEM/465d0e32ca194847b599c429433fec25.png)
在解决这个问题时,小明联想到在学习平行线间的距离时所了解的知识:端点分别在两条平行线上的所有线段中,垂直于平行线的线段最短.进而,小明构造出了如图2的辅助线,并求得PQ的最小值为3.参考小明的做法,解决以下问题:
(1)继续完成阅读材料中的问题:当PQ的长度最小时,
= ;
(2)如图3,延长PA到点E,使AE=nPA(n为大于0的常数).以PE,PB为边作□PBQE,那么对角线PQ的最小值为 ,此时
= ;
(3)如图4,如果P为AB边上的一动点,延长PA到点E,使AE=nPA(n为大于0的常数),以PE,PC为边作□PCQE,那么对角线PQ的最小值为 ,此时
= .
已知:如图1,在Rt△ABC中,∠C=90°,AC=4,BC=3,P为AC边上的一动点,以PB,PA为边构造□APBQ,求对角线PQ的最小值及此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbda5eb3f3becbc98276be833ccbe29f.png)
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748021501952/1573748027564032/STEM/465d0e32ca194847b599c429433fec25.png)
在解决这个问题时,小明联想到在学习平行线间的距离时所了解的知识:端点分别在两条平行线上的所有线段中,垂直于平行线的线段最短.进而,小明构造出了如图2的辅助线,并求得PQ的最小值为3.参考小明的做法,解决以下问题:
(1)继续完成阅读材料中的问题:当PQ的长度最小时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbda5eb3f3becbc98276be833ccbe29f.png)
(2)如图3,延长PA到点E,使AE=nPA(n为大于0的常数).以PE,PB为边作□PBQE,那么对角线PQ的最小值为 ,此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbda5eb3f3becbc98276be833ccbe29f.png)
(3)如图4,如果P为AB边上的一动点,延长PA到点E,使AE=nPA(n为大于0的常数),以PE,PC为边作□PCQE,那么对角线PQ的最小值为 ,此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbda5eb3f3becbc98276be833ccbe29f.png)
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748021501952/1573748027564032/STEM/3869ebd02afe43448b6b400ab8559338.png)
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【推荐1】如图1,二次函数
与x轴交于点A(﹣2,0)、点B(点A在点B左侧),与y轴交于点C(0,3),
.
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026792931328/2943152321798144/STEM/8a946235-928b-4057-9592-f8b35943332e.png?resizew=579)
(1)求二次函数解析式;
(2)如图2,点P是直线BC上方抛物线上一点,PD∥y轴交BC于D,PE∥BC交x轴于点E,求PD+BE的最大值及此时点P的坐标;
(3)在(2)的条件下,当PD+BE取最大值时,连接PC,将
绕原点O顺时针旋转
至
;将原抛物线沿射线CA方向平移
个单位长度得到新抛物线,点M在新抛物线的对称轴上,点N为平面内任意一点,当以点M,N,
,D′为顶点的四边形是矩形时,请直接写出点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb0cd6bd9b3f883ed957628ceb69054.png)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026792931328/2943152321798144/STEM/8a946235-928b-4057-9592-f8b35943332e.png?resizew=579)
(1)求二次函数解析式;
(2)如图2,点P是直线BC上方抛物线上一点,PD∥y轴交BC于D,PE∥BC交x轴于点E,求PD+BE的最大值及此时点P的坐标;
(3)在(2)的条件下,当PD+BE取最大值时,连接PC,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5659cf1e7b89090f313f735ef5b291d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877d67c8decbb7aa0991978b2edfd57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700762875cb4f15b556a72f10a42ac9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
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解答题-问答题
|
困难
(0.15)
名校
【推荐2】如图,在平面直角坐标系中,抛物线
与x轴交于
两点,其中
,与
轴交于
,且过
.连接
,作直线
.
(2)已知直线
下方抛物线上有一动点
,过点
作
轴交直线
于
,过
作
轴交
轴于
,求
的最大值和此时
点坐标;
(3)将原抛物线沿
方向平移
个单位长度得到新抛物线,已知
点是新抛物线上一动点,且
,求所有符合条件的点
的坐标并写出其中一种情况的求解过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2375a27ead9549550676d4e6a2b47243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b5288ad85ce1ff24d0b4053a4869ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee6b00bcefe68ca2ae45c4f661b4db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea9e9c9e878b5e1709338a066c388e3.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20f734ac54ab0eec2e1c170a3a24f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ddeb7ce17137144641f061042c14fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)将原抛物线沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfb52e82ce204ef94f2a11160475102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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