(本小题满分9分)
抛物线y=ax2+bx+4(a≠0)过点A(1,﹣1),B(5,﹣1),与y轴交于点C.
(1)求抛物线的函数表达式;
(2)如图1,连接CB,以CB为边作▱CBPQ,若点P在直线BC上方的抛物线上,Q为坐标平面内的一点,且▱CBPQ的面积为30,求点P的坐标;
(3)如图2,⊙O1过点A、B、C三点,AE为直径,点M为 上的一动点(不与点A,E重合),∠MBN为直角,边BN与ME的延长线交于N,求线段BN长度的最大值.
抛物线y=ax2+bx+4(a≠0)过点A(1,﹣1),B(5,﹣1),与y轴交于点C.
(1)求抛物线的函数表达式;
(2)如图1,连接CB,以CB为边作▱CBPQ,若点P在直线BC上方的抛物线上,Q为坐标平面内的一点,且▱CBPQ的面积为30,求点P的坐标;
(3)如图2,⊙O1过点A、B、C三点,AE为直径,点M为 上的一动点(不与点A,E重合),∠MBN为直角,边BN与ME的延长线交于N,求线段BN长度的最大值.
![](https://img.xkw.com/dksih/QBM/2017/11/20/1821150195662848/1821903872139264/STEM/4e4414ce633d4e8dad132a07c3283e0c.png?resizew=366)
更新时间:2016-12-06 02:01:37
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【推荐1】在
中,
是
边上的高,
,
,
,点M在
上,且
,动点P从点A出发向B运动,速度为每秒1个单位长度.连接
,作点A关于直线
的对称点
,设点P的运动时间为t秒(
).
(1)连接
,当
时,求
的面积.
(2)当点
在
内部(不包括边缘)时,直接写出t的取值范围:______________
(3)若动点P从点A出发,沿折线
以每秒1个单位长度的速度运动,当
时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810fee760e06028fb7d37e65db79bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/89f07c59-7348-4ec6-a6af-d6f6a8e9ac6b.png?resizew=435)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2e118d8156830746055c1b2e759ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)若动点P从点A出发,沿折线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536b51bbdc96d70732e065b64678bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2f9ce7c382455f3048d8db2f3b9003.png)
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【推荐2】如图,抛物线
与x轴分别交于点
、点
,与
轴交于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/85fef20c-1c48-4056-aa1d-80e5e207eace.png?resizew=713)
(1)求抛物线解析式;
(2)点
在第二象限内抛物线上,过点
作
于点
,交
于点
,
,求点
坐标;
(3)在(2)的条件下,延长
至
,使
,连接
,延长
至
,连接
,点
在
上,连接
,过点
作
,垂足为点
,延长
交抛物线于点
,若
,
,求点
坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae9846c5b57180aaecf6c5e33bf22af.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/df30ebcc1196ddc117fd875caae24c0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/85fef20c-1c48-4056-aa1d-80e5e207eace.png?resizew=713)
(1)求抛物线解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd556762d6ae4878a63f855fd7070f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ea832d778d744863b660020bc3b3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874e5199f95ffe3a2a822e44767dde65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a8ec1c634767725275192ed0f0b166.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】如图,在平面直角坐标系中,
的半径为5,点A的坐标为(3,0),
与x轴相交于点B,C,交y轴正半轴于点D.
(1)求点B,D的坐标;
(2)过点B作
的切线,与过点A,C的抛物线交于点P.抛物线交y轴正半轴于点Q.若P的纵坐标为t,四边形PQAC的面积为y.
①求y与t的函数关系式;
②若△PBO与△DOA相似,求
取最小值时m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/ec11a10a-8de7-43d1-9db2-1e13191f701c.png?resizew=186)
(1)求点B,D的坐标;
(2)过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
①求y与t的函数关系式;
②若△PBO与△DOA相似,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21ef28a4e23f1388421f2796b197d40.png)
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【推荐2】如图1,抛物线
与x轴交于点
,B,与y轴交于点C,直线
的解析式为
.
(2)P是
上方抛物线上一点,过点P作
的平行线与
交于点E,与x轴交于点Q,若
,求点P的坐标;
(3)如图2,P是
上方抛物线上一点,过点P作
的垂线,交抛物线于另一点D,Q为平面内一点,若直线
,
与抛物线均只有一个公共点,求证:点Q在某条定直线上.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
(2)P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e9903bae64ea5f0a40039b436dabf1.png)
(3)如图2,P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
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【推荐1】二次函数
的图象记为
,其中
.
(1)请直接写出二次函数
与
轴的交点
及其对称轴;
(2)若二次函数
过点
,其与
轴的另一个交点为
,抛物线
上是否存在点
,使
是直角三角形,若存在,请求出点
的横坐标,若不存在,请说明理由;
(3)在(2)的条件下,二次函数
的图像为
,且夹在直线
与抛物线
之间,二次函数
同时符合以下三个条件:
①当
时,二次函数
最大值与最小值之差为9;
②当
时,
随
的增大而减小;
③若把图象
向左平移3个单位,当
时,
随
的增大而增大;求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daef3546432085a0a7fc652d2f4da8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
(1)请直接写出二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daef3546432085a0a7fc652d2f4da8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daef3546432085a0a7fc652d2f4da8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db609c0ddcb9af21ddbf443d3e527cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)在(2)的条件下,二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40a11d16dda3cd4b4d1bc0fdb48520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0117fb72a34736a47f18fb0cb7fe66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d236129f58cf6f67f060393581f83298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40a11d16dda3cd4b4d1bc0fdb48520c.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1ff41ddea19ffb1102a81c404764d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③若把图象
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1ff41ddea19ffb1102a81c404764d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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解题方法
【推荐2】定义:将函数C1的图象绕点P(m,0)旋转180°,得到新的函数C2的图象,我们称函数C2是函数C1关于点P的相关函数。例如:当m=1时,函数y=(x-3)2+9关于点P(1,0)的相关函数为y=-(x+1)2-9.
(1)当m=0时,
①一次函数y=-x+7关于点P的相关函数为_______;
②点A(5,-6)在二次函数y=ax2-2ax+a(a≠0)关于点P的相关函数的图象上,求a的值;
(2)函数y=(x-2)2+6关于点P的相关函数是y= -(x-10)2-6,则m=_______
(3)当m-1≤x≤m+2时,函数y=x2-6mx+4m2关于点P(m,0)的相关函数的最大值为8,求m的值.
(1)当m=0时,
①一次函数y=-x+7关于点P的相关函数为_______;
②点A(5,-6)在二次函数y=ax2-2ax+a(a≠0)关于点P的相关函数的图象上,求a的值;
(2)函数y=(x-2)2+6关于点P的相关函数是y= -(x-10)2-6,则m=_______
(3)当m-1≤x≤m+2时,函数y=x2-6mx+4m2关于点P(m,0)的相关函数的最大值为8,求m的值.
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解答题-证明题
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【推荐1】已知AB,CD都是⊙O是直径,点E为弧BD上一点,连接BE,CE,且∠BEC=45°.
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/901f2d69-d7c3-4404-a40d-245379494cf9.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/1246dd1a-aa9d-414f-82fb-8b980c53e4b4.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/bbcebd20-9f02-48b3-986b-087e8c6af534.png?resizew=196)
(1)如图1,求证:
;
(2)如图2,连接AC,过点E作
,垂足为点F,过点A作
,垂足为点G,交EF于点H,求证:
;
(3)如图3,在(2)的条件下,连接DG,FG,DG交EF于点K,若
,
,求EH的长.
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/901f2d69-d7c3-4404-a40d-245379494cf9.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/1246dd1a-aa9d-414f-82fb-8b980c53e4b4.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952062795907072/2967182566326272/STEM/bbcebd20-9f02-48b3-986b-087e8c6af534.png?resizew=196)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
(2)如图2,连接AC,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6813488bd1ea40a3aa5e2cb3be7bf312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78f00b5ce9b3b84aa3fa70545ee443b.png)
(3)如图3,在(2)的条件下,连接DG,FG,DG交EF于点K,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe473058d2ee6e0d52b56a95da7bbb56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c640f5d887fa078c4eab40deac81881d.png)
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【推荐2】如图,AB=4,C为射线BA上一动点,以BC为边向上作正三角形BCD,⊙O过A、C、D三点,E为⊙O上一点,满足AD=ED,直线CE交直线AD于F.
(1)求证:CE∥BD;
(2)设CF=a,若C在线段AB上运动.
①求点E运动的路径长;
②求a的范围;
(3)若AC=1,求 tan∠DEC.
(1)求证:CE∥BD;
(2)设CF=a,若C在线段AB上运动.
①求点E运动的路径长;
②求a的范围;
(3)若AC=1,求 tan∠DEC.
![](https://img.xkw.com/dksih/QBM/2020/6/14/2484391376314368/2491124507328512/STEM/b9caff9c25384cf99e08d475ec4f77fc.png?resizew=228)
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