在平面直角坐标系
中,已知抛物线
的图像与
轴交于点
和点
,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/0951fbc1-94f1-49b9-a31b-c21d842490d8.png?resizew=178)
(1)求抛物线的解析式;
(2)求
的面积;
(3)若点
是抛物线上位于第一象限的一点,问是否存在这样的点
,使得点
到
的距离最大?若存在,请求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f59569cabd37ad8d42b3c18847439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/0951fbc1-94f1-49b9-a31b-c21d842490d8.png?resizew=178)
(1)求抛物线的解析式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)若点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
更新时间:2023-12-09 21:43:07
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相似题推荐
解答题-问答题
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【推荐1】如图1,在平面直角坐标系中,直线
,与y轴交于点B,点C在x轴正半轴上,且
,
(1)求直线
的解析式;
(2)点P是
内部一点,连接
,请直接写出
的最小值;
(3)如图2,将
绕点B旋转,使得
,将
沿直线
平移得到
,连接
、
、C.是否存在点
,使
为等腰三角形?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/26039b312c374f9559870e99e47cc2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df74a82d52fa9d42780887e48fba8d08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/db806669-1aae-4ba8-bf78-d09ee9526bd6.png?resizew=434)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef613539d5e569f11d33c1f46d03120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28583843aa8c06a4ec3a7e90489ced94.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85cb3d0d97248c1c0b252b9ca3da9f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85895df2a4416494ae679f8f9027425b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b59a41faf6296cde8f01cbd85e458c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296eac5061ba699d9dad932dcb68b60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
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【推荐2】在平面直角坐标系中,已知抛物线
(m是常数,且
)经过点
,且与y轴交于点A,其对称轴与x轴交于点B.
(1)求出二次函数的表达式.
(2)垂直于y轴的直线l与抛物线交于点
和
,与直线
交于点
,若
,直接写出
的取值范围.
(3)当
,
,
时,对应的函数值分别为
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbcb3e8fd8247d23112f4f6a14ca24bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5511a368692de27c58ec48ce968de4a4.png)
(1)求出二次函数的表达式.
(2)垂直于y轴的直线l与抛物线交于点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd606aaf4f738ea26996be41bb4b2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1d2961a99eb739c17979139ea5b34e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e92826a5c02def677932c072a9274c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dcee29fdf5ec1ebd5f00c494c3fcb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae24688d4c45aad43e9af0b7bbfda6b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd047bb58da851639249cf8d2154df91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2744dded15ba9f22006bbac1efe7d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1291afa281f5dce42c054a1700ddab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bfc36c8586b3100a56c20d109f60e0.png)
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【推荐1】在平面直角坐标系中,
为坐标原点,抛物线
与
轴交于点
.
(1)求抛物线的解析式.
(2)如图,将抛物线
向左平移1个单位长度,记平移后的抛物线顶点为
,平移后的抛物线与
轴交于
两点(点
在点
的右侧),与
轴交于点
.判断以
三点为顶点的三角形是否为直角三角形,并说明理由.
(3)直线
与抛物线
交于
两点(点
在点
的右侧),当
轴上存在一点
,能使以
三点为顶点的三角形与
相似时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43029dfd2a2b47b764679b92dab02259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2b1410f44205658cea90e9ce85101c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/27f91925-52c4-454a-ad0c-0f6c1d333ae2.png?resizew=408)
(1)求抛物线的解析式.
(2)如图,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43029dfd2a2b47b764679b92dab02259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/c28e111bfa9ab7295f9689451da535ba.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43029dfd2a2b47b764679b92dab02259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efffea876bae5264944c1e2243686ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
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【推荐2】如图,抛物线
交y轴于点
,交x轴于点
和点B(点A在点B的左侧).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/26385986-c6a3-4a64-9c9d-9c5669c6895e.png?resizew=121)
(1)求该抛物线的函数表达式;
(2)在抛物线的对称轴上是否存在点P,使点A、B、P构成的三角形是以
为斜边的直角三角形?若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df573e9c4cd69bd8918f991b284526e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5558ffa6dc28d437c0467c7f361d444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/26385986-c6a3-4a64-9c9d-9c5669c6895e.png?resizew=121)
(1)求该抛物线的函数表达式;
(2)在抛物线的对称轴上是否存在点P,使点A、B、P构成的三角形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】如图,以P为顶点的抛物线y=
(x﹣m)2+k交y轴于点A,经过点P的直线y=﹣2x+3交y轴于点B.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698763488501760/2700901232017408/STEM/56d62280-74b7-4243-9340-fe261f89fd76.jpg?resizew=167)
(1)用关于m的代数式表示k.
(2)若点A在B的下方,且AB=2,求该抛物线的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698763488501760/2700901232017408/STEM/56d62280-74b7-4243-9340-fe261f89fd76.jpg?resizew=167)
(1)用关于m的代数式表示k.
(2)若点A在B的下方,且AB=2,求该抛物线的函数表达式.
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【推荐2】如图1,二次函数
的图象与
轴交于两点,其中点
坐标
,点
、
在抛物线上,
为抛物线的顶点.
![](https://img.xkw.com/dksih/QBM/2020/11/8/2590796475932672/2610519959814144/STEM/fe07cf76-91c8-411f-964e-3cdd0f2f17aa.png)
![](https://img.xkw.com/dksih/QBM/2020/11/8/2590796475932672/2610519959814144/STEM/fbf8051a-b262-474c-a4b1-265fe15dc93d.png)
(1)求抛物线的解析式;
(2)若点
是抛物线对称轴上一点,求
周长的最小值.
(3)如图2,设
是
轴上一点,且
,过
作
轴的垂线交抛物线于点
,交直线
于点
,求
面积的最大值.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deaaaa0db2aa5b7bf70aabb65edbe496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da50ebd2656745259525c8b157e389e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2020/11/8/2590796475932672/2610519959814144/STEM/fe07cf76-91c8-411f-964e-3cdd0f2f17aa.png)
![](https://img.xkw.com/dksih/QBM/2020/11/8/2590796475932672/2610519959814144/STEM/fbf8051a-b262-474c-a4b1-265fe15dc93d.png)
(1)求抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7599fa3f72415fe7e2b9fcaea016b2c2.png)
(3)如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e421f6929e309d879e56b1d282b6af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac335c09110a7ac51d330f722881d691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
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【推荐3】11月16日,长沙市望城区“我们的韶华映朝阳”第二届“雷小锋”超级运动会火热开幕,望城是雷锋的故乡,每年的3月5日是学雷锋纪念日,我们不妨约定:在平面直角坐标系中,将点
称为“雷小锋点”,经过点
的函数,称为“榜样函数”.
(1)若点
是“雷小锋点”,关于
的函数
是“榜样函数”,则
______,
______,
______.
(2)若关于
的函数
和
都是“榜样函数”,且两个函数图象有且只有一个交点,求
的值.
(3)抛物线
与榜样函数
交于
、
两点,若
时,线段
有最小值
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9828e2abd5761f8f27c6974fe1b70b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9828e2abd5761f8f27c6974fe1b70b27.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52efb4a2b0583b9abfaba29fcff4bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe3fac3bebb72911f3037954dc19602b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1b00b7bd545143c6dd57eabff9a1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5848d7371b15965ab8990329fe04bd.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/a197640bfe1b13d7ef6d0926b261c2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解题方法
【推荐1】如图,抛物线
经过直线
与坐标轴的两个交点A、B,此抛物线与x轴的另一个交点为C,抛物线的顶点为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/20daad23-eff2-4c7b-99a9-d75b967c7c98.png?resizew=150)
(1)求此抛物线的解析式;
(2)点P为抛物线上的一个动点,求使
的点P的坐标;
(3)
是过A、B、C三点的圆,连接
、
、
,求劣弧
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc229acc8bf1a2047394bda863b1ea71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e235d7dd12f948f5ffb2e5afddc95612.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/20daad23-eff2-4c7b-99a9-d75b967c7c98.png?resizew=150)
(1)求此抛物线的解析式;
(2)点P为抛物线上的一个动点,求使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8acfef2332e9fd3847f7cb43a227ddf.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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【推荐2】如图,若抛物线
与直线
的两个交点A,B关于原点对称,则称线段AB为抛物线的“对称弦”,该直线为抛物线的“对称弦直线”.已知抛物线
交y轴于点
,与其“对称弦直线”
交于点A,B.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2973474160287744/2981418175168512/STEM/e5ca3151-760e-4f83-979d-0d5b9386e7e6.png?resizew=495)
(1)若该抛物线的“对称弦直线”为
,求抛物线的函数解析式;
(2)在(1)的条件下,点P为抛物线上A点右侧一点,连接CP交AB于点E,连接BP,BC,当
时,求P点坐标;
(3)当该抛物线对称轴在y轴左侧时,抛物线上是否存在点H,使得
是以“对称弦”AB为斜边的等腰直角三角形,若存在,请求出此时抛物线解析式;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e927521ec50d886fc50746f788961d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ec7f84f716a316ec92d133927666c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2973474160287744/2981418175168512/STEM/e5ca3151-760e-4f83-979d-0d5b9386e7e6.png?resizew=495)
(1)若该抛物线的“对称弦直线”为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
(2)在(1)的条件下,点P为抛物线上A点右侧一点,连接CP交AB于点E,连接BP,BC,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7da85bd800413343402a35f5f4d883.png)
(3)当该抛物线对称轴在y轴左侧时,抛物线上是否存在点H,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
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【推荐3】如图1,在平面直角坐标系xOy中,已知A、B两点的坐标分别为(﹣4,0)、(4,0),C(m,0)是线段AB上一动点(与A、B两点不重合),抛物线l1:y=ax2+b1x+c1(a>0)经过点A、C,顶点为D,抛物线l2:y=ax2+b2x+c2(a>0)经过点C、B,顶点为E,直线AD、BE相交于F.
(1)若a=
,m=﹣1,求抛物线l1、l2的解析式;
(2)若a=1,∠AFB=90°,求m的值;
(3)如图2,连接DC、EC,记△DAC的面积为S1,△ECB的面积为S2,△FAB的面积为S,问是否存在点C使得2S1•S2=a•S,若存在,请求出C的坐标;若不存在,请说明理由.
(1)若a=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)若a=1,∠AFB=90°,求m的值;
(3)如图2,连接DC、EC,记△DAC的面积为S1,△ECB的面积为S2,△FAB的面积为S,问是否存在点C使得2S1•S2=a•S,若存在,请求出C的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/8/27/2019300422664192/2020071802830848/STEM/ad527a730cce4af49c2589a7cc17a594.png?resizew=329)
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