如图,直线
与
轴交于点
,与
轴交于点
,过点
的抛物线
与
轴的另一个交点为
.
(1)求抛物线的解析式和点
的坐标;
(2)
是直线
上方抛物线上一动点,
交
于
.设
,请求出
的最大值和此时点
的坐标;
(3)
是
轴上一动点,连接
,将
绕点
逆时针旋转
得线段
,若点
恰好落在抛物线上,请直接写出此时点
的坐标.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252940644352/2492464332988416/STEM/38ee8654a39d4d7a9ae9a86ee3aa2360.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca65ccb18d7867cbb8f0e436f49d122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.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/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)求抛物线的解析式和点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e618631de644686079309964bebc9a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)
![](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/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252940644352/2492464332988416/STEM/8cfc0400c5fe4ffabd1698d67b3105f6.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252940644352/2492464332988416/STEM/38ee8654a39d4d7a9ae9a86ee3aa2360.png?resizew=172)
备用图
更新时间:2020-06-25 21:14:34
|
相似题推荐
解答题-证明题
|
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【推荐1】如图①,
和
是有公共顶点的等腰直角三角形,
,点P为射线
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/863bc792-a049-4809-86bb-0ef6d523914e.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/5ddb8908-afd1-4e44-aa5a-5afe91245e98.png?resizew=221)
(1)如图②,将
绕点A旋转,当C、D、E在同一条直线上时,连接
、
,求证:
且
.
(2)若
,把
绕点A旋转,
①当
时,求
的长;
②旋转过程中线段
长的最小值是_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/863bc792-a049-4809-86bb-0ef6d523914e.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/5ddb8908-afd1-4e44-aa5a-5afe91245e98.png?resizew=221)
(1)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed9b4054d15a5c4582d15b7a8ef34875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c65319e9026d1db4d468f69fd8f9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②旋转过程中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】如图1,在平面直角坐标系中,直线y=﹣
x+3与x轴交于点A,与y轴交于点B,抛物线过点A、B和点C(﹣4,0).
(1)求抛物线的解析式;
(2)如图1,连接BC,若点P在线段AB上方的抛物线上移动,过点P作PQ∥BC交AB于Q点,求4PQ+
BQ的最大值及此时点P的坐标;
(3)如图2,将该抛物线沿射线CB的方向平移5个单位长度得到新抛物线,平移后的新抛物线与原抛物线交于点R,M点在新抛物线的对称轴上,在平面内是否存在点N,使得以点A、R、M、N为顶点的四边形为矩形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求抛物线的解析式;
(2)如图1,连接BC,若点P在线段AB上方的抛物线上移动,过点P作PQ∥BC交AB于Q点,求4PQ+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
(3)如图2,将该抛物线沿射线CB的方向平移5个单位长度得到新抛物线,平移后的新抛物线与原抛物线交于点R,M点在新抛物线的对称轴上,在平面内是否存在点N,使得以点A、R、M、N为顶点的四边形为矩形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/3566eba5-4fcc-41a2-a07a-ce3dd349848c.png?resizew=508)
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【推荐3】二次函数y=ax2+bx+4的图象与x轴交于两点A、B,与y轴交于点C,且A(﹣1,0)、B(4,0).
(2)①如图1,抛物线的对称轴m与x轴交于点E,CD⊥m,垂足为D,点F(﹣
,0),动点N在线段DE上运动,连接CF、CN、FN,若以点C、D、N为顶点的三角形与△FEN相似,求点N的坐标;
②如图2,点M在抛物线上,且点M的横坐标是1,将射线MA绕点M逆时针旋转45°,交抛物线于点P,求点P的坐标;
(3)已知Q在y轴上,T为二次函数对称轴上一点,且△QOT为等腰三角形,若符合条件的Q恰好有2个,直接写出T的坐标.
(2)①如图1,抛物线的对称轴m与x轴交于点E,CD⊥m,垂足为D,点F(﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a810acf95bbbcc72d30d2bd65f6aea9.png)
②如图2,点M在抛物线上,且点M的横坐标是1,将射线MA绕点M逆时针旋转45°,交抛物线于点P,求点P的坐标;
(3)已知Q在y轴上,T为二次函数对称轴上一点,且△QOT为等腰三角形,若符合条件的Q恰好有2个,直接写出T的坐标.
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【推荐1】如图,在平面直角坐标系中,抛物线
与y轴交于点
,与x轴交于
、C两点(点B在点C的左侧),抛物线的顶点为D.
(1)求抛物线的表达式及顶点D的坐标;
(2)点P是线段
上的动点.
①过点P作x轴的垂线交抛物线于点E,若
,求点E的坐标;
②若点Q是射线
上的动点,且始终满足
,连接
,
,请求出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df573e9c4cd69bd8918f991b284526e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8314b1fdf7dcef270ac0a2567609242.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/029d7b28-a17c-4141-96d4-5c150ba6c9aa.png?resizew=204)
(1)求抛物线的表达式及顶点D的坐标;
(2)点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
①过点P作x轴的垂线交抛物线于点E,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcf0b08d002a21f5494032cf0d15440.png)
②若点Q是射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5f319082185eb0858f5be688af6ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22055f62f289541b40011528d649aa09.png)
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【推荐2】如图,抛物线y = x2+bx+c过点A (-1,2),且关于y轴对称,点C与点B(a,0)(a>1)关于原点对称,直线AC交抛物线于点D.
(1)求此抛物线的解析式;
(2)连接OA,BD,当OA//BD时,求a的值;
(3)若直线AC交抛物线
于E,F两点(点E在点F的左侧),且EA=DF,求直线AC的解析式.
(1)求此抛物线的解析式;
(2)连接OA,BD,当OA//BD时,求a的值;
(3)若直线AC交抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff69135fb13cf18085e29b9d5a83a8b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/9f6caa3c-32ae-46c0-9a5e-af2b7ab86dc2.png?resizew=144)
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【推荐1】如图①,在等腰直角三角形
中,
,D,E分别为
的中点,F为线段
上一动点(不与D,E重合),将线段
绕点A按逆时针方向旋转
得到
,连接
.
(1)求证:
.
(2)如图②,连接
,
交
于点H.
①证明:在点F的运动过程中,总有
;
②若
,直接写出当
的长度是多少时,为
为等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40601c342828971a4fcf42930c6e68c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/1656a7ca-2d5b-4a83-a548-fddd123ee888.png?resizew=373)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b555c998a7dc9971c619a8bd44890f7.png)
(2)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53d404e0ba5ee173ea8761aa28936f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①证明:在点F的运动过程中,总有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1563ce496f108272863a8fcc9fdd1aa4.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f8b3d45ae1743416253d835c054456.png)
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【推荐2】在平面直角坐标系中,四边形
是矩形,点
,点
,点
,以点A为中心,顺时针旋转矩形
,得到矩形
,点O,B,C的对应点分别为D,E,F,记旋转角为α(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/3a9ad1b6-3e39-4b65-837f-3640d729cc20.png?resizew=316)
(1)如图①,当
时,求点D的坐标;
(2)如图②,当点E落在
的延长线上时,求点D的坐标;
(3)当点D落在线段
上时,求点E的坐标(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9040cff7e9e20dd2817ad9888237d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/109a293cef44f23e86e22c1a4cfcbbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f91d3dae606eb82b05160c222766ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9040cff7e9e20dd2817ad9888237d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/3a9ad1b6-3e39-4b65-837f-3640d729cc20.png?resizew=316)
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
(2)如图②,当点E落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)当点D落在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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【推荐3】(为方便答题,可在答题卡上画出你认为必要的图形)
在Rt△ABC中,∠A=90°,AC=AB=4,D,E分别是边AB,AC的中点.若等腰Rt△ADE绕点A逆时针旋转,得到等腰RtRt△AD1E1,设旋转角为α(0<α≤180°),记直线BD1与CE1的交点为P.
(1)如图1,当α=90°时,线段BD1的长等于 ,线段CE1的长等于 ;(直接填写结果)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871232819200/1573871239102464/STEM/350ac1439e4c47b1a146c5509a2a68fb.png)
(2)如图2,当α=135°时,求证:BD1=CE1 ,且BD1⊥CE1 ;
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871232819200/1573871239102464/STEM/4e0c5879a3534067a7c66d4787220862.png)
(3)求点P到AB所在直线的距离的最大值.(直接写出结果)
在Rt△ABC中,∠A=90°,AC=AB=4,D,E分别是边AB,AC的中点.若等腰Rt△ADE绕点A逆时针旋转,得到等腰RtRt△AD1E1,设旋转角为α(0<α≤180°),记直线BD1与CE1的交点为P.
(1)如图1,当α=90°时,线段BD1的长等于 ,线段CE1的长等于 ;(直接填写结果)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871232819200/1573871239102464/STEM/350ac1439e4c47b1a146c5509a2a68fb.png)
(2)如图2,当α=135°时,求证:BD1=CE1 ,且BD1⊥CE1 ;
![](https://img.xkw.com/dksih/QBM/2015/7/14/1573871232819200/1573871239102464/STEM/4e0c5879a3534067a7c66d4787220862.png)
(3)求点P到AB所在直线的距离的最大值.(直接写出结果)
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