如图,抛物线
与
轴交于
两点(点
在点
的左侧),点
的坐标为
,与
轴交于点
,直线
与
轴交于点
.动点
在抛物线上运动,过点
作
轴,垂足为点
,交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/a9e55a1d-13aa-49e5-980b-ffca58467864.png?resizew=145)
(1)求抛物线的表达式;
(2)当点
在线段
上时,
的面积是否存在最大值,若存在,请求出最大值;若不存在,请说明理由;
(3)点
在运动过程中,能否使以
为顶点的三角形是以
为腰的等腰直角三角形?若存在,请直接写出点
的坐标.
![](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/0ae6f48b9a53c0155a692509cf31f7e6.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/97b3c94d505e7c5bcce94afec4af3d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f6ff55f78c657911007e5c5c8b7ab2.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff95970af540cc15b7de34dcb670f3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/a9e55a1d-13aa-49e5-980b-ffca58467864.png?resizew=145)
(1)求抛物线的表达式;
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d761700f53254fe90583e5a33481429d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
更新时间:2024-03-22 22:21:24
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相似题推荐
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适中
(0.65)
【推荐1】已知抛物线
与
轴交于点
,对称轴为
.
试用含
的代数式表示
、
;
当抛物线与直线
交于点
时,求此抛物线的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f2638d71e5d00c241c6704b32094d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9a5c354f2098495c9cf2da37de5942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679353e656a54993c041ebd39ec7b31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2341f404b0384056d86c32be4032a9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f664f84fb215ff9c26b4ebd3389dfa.png)
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【推荐2】已知抛物线
与x轴交于
,
两点,与y轴交于点
,其对称轴与x轴交于点D,E为顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/38c6d562-07fd-427b-bd0e-776603a96878.png?resizew=203)
(1)求抛物线的解析式;
(2)在下图中作出该函数的图象并回答:
①该抛物线的对称轴为直线______;
②该抛物线的最大值为______;
(3)①若
,则
______;
若
无实数根,则t的取值范围是______;
②若
,则x的取值范围是______;
③若
,则x的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/38c6d562-07fd-427b-bd0e-776603a96878.png?resizew=203)
(1)求抛物线的解析式;
(2)在下图中作出该函数的图象并回答:
①该抛物线的对称轴为直线______;
②该抛物线的最大值为______;
(3)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f7f8806b67df8ad7afc86ebece91f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10e0126f5333b2aa6e345e72b85b61f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15a35f0c1078e0df414d8f8e3739652.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609d94a721537e629de31a97995e7a1f.png)
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【推荐1】如图,直线l经过A(3,0),B(0,3)两点与二次函数y=x2+1的图象在第一象限内相交于点C.
(1)求△AOC的面积;
(2)求二次函数图象的顶点D与点B,C构成的三角形的面积.
(1)求△AOC的面积;
(2)求二次函数图象的顶点D与点B,C构成的三角形的面积.
![](https://img.xkw.com/dksih/QBM/2014/11/21/1573758223384576/1573758229020672/STEM/b42aef5ea73045c1b44f3c03f4ab22d1.png?resizew=108)
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【推荐2】如图,二次函数
的图象与x轴交于O(O为原点),A两点,已知二次函数图象经过点
,且其对称轴为直线
.
(2)已知y轴上一点
,点P是二次函数图象上位于x轴下方的一点,连接
.设点P的横坐标为t,
的面积为S.
①求S与t之间的函数表达式(不要求写自变量的取值范围);
②当S取最大值时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1d51b51786a763f5f7709600dd4512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
(2)已知y轴上一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72153d484326affcc81c56a24761a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
①求S与t之间的函数表达式(不要求写自变量的取值范围);
②当S取最大值时,求点P的坐标.
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【推荐1】如图,已知在平面直角坐标系中,直线
与x轴交于点A,与y轴交于点C,经过点A、C的拋物线
(a、b为常数,且
)与x轴的另一个交点为
,抛物线的对称轴l与x轴交于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/c8d98dff-bdb1-4df4-9397-2afad6f985b0.png?resizew=121)
(1)求点A的坐标和抛物线的函数表达式;
(2)在抛物线的对称轴l上是否存在点P,使得以点A、C、P为顶点的三角形是以
为直角边的直角三角形?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373e940578737a54a51be72e53a31c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f605a7fc2f1064fe14882ee426839db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/c8d98dff-bdb1-4df4-9397-2afad6f985b0.png?resizew=121)
(1)求点A的坐标和抛物线的函数表达式;
(2)在抛物线的对称轴l上是否存在点P,使得以点A、C、P为顶点的三角形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】如图,二次函数
的图象交
轴于
、
两点,交
轴于点
且
,将
绕点
按逆时针方向旋转
,
点恰好与
重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/4c4dda7d-f034-4d42-95cc-e8296fd02116.png?resizew=171)
(1)求该二次函数的解析式;
(2)若点
为线段
上的任一动点,过点
作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,交
于点
,连结
,求
面积
的最大值;
(3)对称轴上是否存在一点
,使
为直角三角形,直接写出
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31c11665576d5ae71a11d8d25d72cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c40363a7a1e4d68af8e5a84e5adb5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea7250b555cef87fa1dfd50f8cd1f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/4c4dda7d-f034-4d42-95cc-e8296fd02116.png?resizew=171)
(1)求该二次函数的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fb3fd02b6a29ddb0636b54d64f5b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)对称轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4edd4d6067c20c1e680d730dbb6d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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