如图,在平面直角坐标系
中,抛物线
;与x轴交于点A和C,与y轴交于点B.点P为直线
上方抛物线上一动点,过点P作
轴于点Q,交线段
于点M,已知点
,且
.
(2)求当M是
中点时的P点坐标;
(3)作
,垂足为N,连接
,
.
请从下列两个问题中任选一个问题完成.
问题①:求
的最大值;问题②:求
的面积最大值.
(4)连接
,当x为何值时,四边形
为平行四边形?四边形
能为菱形吗?若能求出P点坐标;若不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
(2)求当M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f22283744d2e7cc62bc6461ac92fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
请从下列两个问题中任选一个问题完成.
问题①:求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08cb654f7e537f6d88057e292b018ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08cb654f7e537f6d88057e292b018ba.png)
更新时间:2024-04-17 11:02:47
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【推荐1】在平面直角坐标系
中,抛物线
与x轴交于点
,与y轴交于点C,点F是抛物线上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/a9c97cad-aa55-45d7-8157-abff714f7656.png?resizew=327)
(1)求抛物线的解析式;
(2)当点F在第一象限运动时,连接线段
,且
.当S取最大值时,求点F的坐标;
(3)过点F作
轴交直线
于点D,交x轴于点E,若
,求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39dd70f6ef25a564c638be6c576585ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c18ce82349fc1b3e932f2b816e25bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/a9c97cad-aa55-45d7-8157-abff714f7656.png?resizew=327)
(1)求抛物线的解析式;
(2)当点F在第一象限运动时,连接线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68c126b9bd23118a0eb3cce6ed880ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e6151dc6ef89bc79b1ca0dc63b291e.png)
(3)过点F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e7cf15025c0d3c813c21888ba21dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46de8ca9939c6d6fcc5b4cc898032d1.png)
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【推荐2】如图,抛物线
与x轴交于A、B
两点,与y轴交于点C
,点P
是抛物线上的一动点.
(2)如图1,当点P
在直线
上方时,过点P作y轴的平行线交直线
于点E.
①求
面积的最大值;
②点M是平面直角坐标系内一点,是否存在点P,使得以点B,E,P,M为顶点的四边形是菱形,若存在,请求出所有点M的坐标;若不存在,请说明理由;
(3)如图2,点D是抛物线的顶点,过点D作
交抛物线于点Q,过点D作
于点H,请直接写出点H到抛物线对称轴距离的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f752ae28a6c9b614317b7da1d3cddb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2159272005e0a732f1b3e68f99fcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778637841c9e5579d98d6c29dcec0c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f109f8b4fa6498206d3c0c428762c5.png)
(2)如图1,当点P
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f109f8b4fa6498206d3c0c428762c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f409b28f7cb97726646e79709ad25190.png)
②点M是平面直角坐标系内一点,是否存在点P,使得以点B,E,P,M为顶点的四边形是菱形,若存在,请求出所有点M的坐标;若不存在,请说明理由;
(3)如图2,点D是抛物线的顶点,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4410b930ed684f0a8691c6ba4321fa1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561702aee9a5bc51f4a1a8927afcb102.png)
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解题方法
【推荐1】我们不妨约定:对角线互相垂直的凸四边形叫做“十字形”.(注:凸四边形就是没有角度数大于180°的四边形,把四边形的任何一边向两方延长,其他各边都在延长所得直线的同一旁,这样的四边形叫做凸四边形.)
(1)①在“平行四边形,矩形,菱形,正方形”中,一定是“十字形”的有_________;②在凸四边形
中,
且
,则该四边形_________“十字形”.(填“是”或“不是”)
(2)如图1,
,
,
,
是半径为1的
上按逆时针方向排列的四个动点,
与
交于点
,
,当
时,求
的取值范围;
(3)如图2,在平面直角坐标系
中,抛物线
(
,
,
为常数,
,
)与
轴交于
,
两点(点
在点
的左侧),
是抛物线与
轴的交点,点
的坐标为
,记“十字形”
的面积为
,记
,
,
,
的面积分别为
,
,
,
.求同时满足下列三个条件的抛物线的解析式:①
;②
;③“十字形”
的周长为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/d4828ba2-3b63-4ddf-82e8-74b9737b132f.png?resizew=293)
(1)①在“平行四边形,矩形,菱形,正方形”中,一定是“十字形”的有_________;②在凸四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2f0c019a85eecb12465e7784c9ed98.png)
(2)如图1,
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da892493e8870249425d2556acf4c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf93316f74047047c8ab340c6be58b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)如图2,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](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/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.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/c5db41a1f31d6baee7c69990811edb9f.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69766ccdfee001eb522c91870b5a0aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4459eaa92f139d29880307b21e9b7611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f5f078c32f5caf439bac951d450fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4962343ca7d065aee473dbf79eb8d3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692abe1f680b914dc1c6d8354a54188c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a1b396b1220e363eaacb02b24eeeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ffadd8819f267d10958405eb1c2c39f.png)
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【推荐2】问题提出:
如图,四边形是矩形,
,E为射线
上的动点,连接
,过E作
(点F在
的左侧),且
,过D作
交射线
于点G,连接
,设
长为x,四边形
的面积为y(x,y均可等于0).
初步感知:
(1)如图1,当点E由点D运动到点A时,经探究发现y是关于x的二次函数,l为其对称轴,请根据图象信息求y关于x的函数解析式及线段的长;
(2)当点E在线段的延长线上运动时,求y关于x的函数解析式;
延伸探究:
(3)若存在三个不同位置的点E(从右向左依次用表示),对应的四边形
面积均相等.
①试确定的数量关系,并说明理由;
②当时,求四边形
的面积.
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【推荐3】如图1,抛物线y=ax2+bx+c(a>0)的顶点为M,平行于x的直线与抛物线交于点A,B,若△AMB为等腰直角三角形,则抛物线上A,B两点之间的部分与线段AB围成的图形称为该抛物线对应的“准碗形”,线段AB称为碗宽,点M到线段AB的距离称为碗高.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/b827401f-9d1d-4252-8466-c954103fdefd.png?resizew=524)
(1)抛物线y=
x2对应的碗宽为 ;
(2)抛物线y=ax2(a>0)对应的碗宽为 ;抛物线y=a(x﹣2)2+3(a>0)对应的碗高为 ;
(3)已知抛物线y=ax2﹣4ax﹣
(a>0)对应的碗高为3.
①求碗顶M的坐标;
②如图2,将“准碗形AMB”绕点M顺时针旋转30°得到“准碗形
”.过点
作x轴的平行线交准碗形
于点C,点P是线段
上的动点,过点P作y轴的平行线交准碗形A'MB'于点Q.请直接写出线段PQ长度的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/b827401f-9d1d-4252-8466-c954103fdefd.png?resizew=524)
(1)抛物线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)抛物线y=ax2(a>0)对应的碗宽为 ;抛物线y=a(x﹣2)2+3(a>0)对应的碗高为 ;
(3)已知抛物线y=ax2﹣4ax﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa585b9257ed0798213a9ae9b87d291.png)
①求碗顶M的坐标;
②如图2,将“准碗形AMB”绕点M顺时针旋转30°得到“准碗形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4bbed53e4af0e182d06306bcb6a45b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4bbed53e4af0e182d06306bcb6a45b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195b7c84e9dadefbc35d674288314535.png)
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【推荐1】(1)问题提出:如图①,在
中,
,BD是
的平分线,
,求
的面积.
(2)问题解决:如图②,是某公园内一块绿地的平面示意图,其形状为四边形ABCD,
,BD是一条长200米的健身步道,且BD是
的平分线,
.为了增加花卉的种植面积,规划在BD上找点P,在BC上找点Q,沿线段AP、PQ修建两条健身步道,将四边形ABCD分成四个区域,其中阴影区域将种植花卉,若
,设BP的长为x(米),种植花卉区域的面积为y(平方米).
①求y与x之间的函数关系式;
②试求当新修建的健身步道总长度
最小时,种植花卉区域的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2bc4da450e16a913c8c05bc91aad666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)问题解决:如图②,是某公园内一块绿地的平面示意图,其形状为四边形ABCD,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d94a8d285b34d10c1b1e2e53dab578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076b8a3c8ae3e3b7d368e8f83ae5bb4e.png)
①求y与x之间的函数关系式;
②试求当新修建的健身步道总长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac832045352a884540702e179bc00da.png)
![](https://img.xkw.com/dksih/QBM/2022/6/14/3000995084853248/3001026443026432/STEM/83a49e573bb9464bad6c07098ff2590e.png?resizew=405)
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【推荐2】![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/223336c9-3c50-4e8c-ab9f-ea144f8ce08a.png?resizew=420)
(1)如图1,在四边形ABCD中,点P为AB上点,
,若
,
,则
______;
(2)如图2,四边形ABCD中,
,
,
,点E在线段BC上且
,连接DE,作EF⊥DE,交AB于点F,则四边形ADEF的面积为______.
(3)某精密仪器厂接到生产一种特殊四边形金属部件的任务,部件要求:如图3,四边形ABCD中,
厘米,点C到AB的距离为5厘米,
且
.在满足要求和保证质量的前提下,仪器厂希望造价最低,已知这种金属材料每平方厘米造价50元.请问一个这种四边形金属部件的造价最低是多少元?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/223336c9-3c50-4e8c-ab9f-ea144f8ce08a.png?resizew=420)
(1)如图1,在四边形ABCD中,点P为AB上点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7502d2b89b731a7c11faa97815d46d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26a76e5cdb9c2ac5d7622691486442c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)如图2,四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18b5e7ad8fde2001e99ae54838adb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fd368efb51a5ae90c0f3e276704d2.png)
(3)某精密仪器厂接到生产一种特殊四边形金属部件的任务,部件要求:如图3,四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510634e49198fc429d942d00fa5446ab.png)
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【推荐3】如图,抛物线y=﹣x2+bx+c交x轴负半轴于点A,交X轴正半轴于点B,交y轴 正半轴于点C,直线BC的解析式为y=kx+3(k≠0 ),∠ABC=45°,
(1)求b、c的值;
(2)点P在第一象限的抛物线上,过点P分别作x轴、y轴的平行线,交直线BC于点M、N,设点P的横坐标为t,线段MN的长为d,求d与t之间的函数关系式(不要求写出自变量t的取值范围);
(3)在(2)的条件下,点E为抛物线的顶点,连接EC、EP、AP,AP交y轴于点D,连接DM,若∠DMB=90°,求四边形CMPE的面积.
(1)求b、c的值;
(2)点P在第一象限的抛物线上,过点P分别作x轴、y轴的平行线,交直线BC于点M、N,设点P的横坐标为t,线段MN的长为d,求d与t之间的函数关系式(不要求写出自变量t的取值范围);
(3)在(2)的条件下,点E为抛物线的顶点,连接EC、EP、AP,AP交y轴于点D,连接DM,若∠DMB=90°,求四边形CMPE的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/7/b59de509-fef5-4daf-9381-2c51d39a1bc6.png?resizew=471)
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解题方法
【推荐1】如图,在平面直角坐标系中,直线
分别与x轴、y轴相交于点B、C,经过点B、C的抛物线
与x轴的另一个交点为A(-1,0).
(1)求这个抛物线的表达式;
(2)已知点D在抛物线上,且横坐标为2,求出△BCD的面积;
(3)点P是直线BC上方的抛物线上一动点,过点P作PQ垂直于x轴,垂足为Q.是否存在点P,使得以点A、P、Q为顶点的三角形与△BOC相似?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/b3dea3495a1c3975fe15e5e4854fe6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df573e9c4cd69bd8918f991b284526e.png)
(1)求这个抛物线的表达式;
(2)已知点D在抛物线上,且横坐标为2,求出△BCD的面积;
(3)点P是直线BC上方的抛物线上一动点,过点P作PQ垂直于x轴,垂足为Q.是否存在点P,使得以点A、P、Q为顶点的三角形与△BOC相似?若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/7aa72ac1-d5f2-492d-a623-883c981d88e9.png?resizew=362)
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【推荐2】综合与探究
如图,抛物线y=−
x2+
x+4与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,连接BC.
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986508533112832/2989206771564544/STEM/36828b9f-f22b-4e44-a17f-450141560c97.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986508533112832/2989206771564544/STEM/e6a5be01-2883-4a95-a1f0-b116cf574b19.png?resizew=175)
(1)求A,B,C三点及抛物线顶点的坐标;
(2)点D是抛物线上的一个动点,设点D的横坐标为m(0<m<3),连接DB,DC.当△BCD的面积最大时,求m的值;
(3)试探究:在y轴上是否存在点P,使得∠PAO=
∠ABC,若存在,请直接写出点P的坐标;若不存在,请说明理由.
如图,抛物线y=−
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0b6452a3d526d760136e5c8936ba8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a94c29391d9f14bc34da9e1f5112b7f.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986508533112832/2989206771564544/STEM/36828b9f-f22b-4e44-a17f-450141560c97.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986508533112832/2989206771564544/STEM/e6a5be01-2883-4a95-a1f0-b116cf574b19.png?resizew=175)
(1)求A,B,C三点及抛物线顶点的坐标;
(2)点D是抛物线上的一个动点,设点D的横坐标为m(0<m<3),连接DB,DC.当△BCD的面积最大时,求m的值;
(3)试探究:在y轴上是否存在点P,使得∠PAO=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
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【推荐3】如图,在平面直角坐标系中,矩形
的边
与x轴、y轴的交点分别为
,抛物线
过B,C两点,动点M从点D开始以每秒5个单位长度的速度沿
的方向运动到达C点后停止运动.动点N从点O以每秒4个单位长度的速度沿
方向运动,到达C点后,立即返回,向
方向运动,到达O点后,又立即返回,依此在线段
上反复运动,当点M停止运动时,点N也停止运动,设运动时间为
.
(2)求点D的坐标;
(3)当点M,N同时开始运动时,若以点M,D,C为顶点的三角形与以点B,O,N为顶点的三角形相似,求t的值;
(4)过点D与x轴平行的直线,交抛物线的对称轴于点Q,将线段
沿过点B的直线翻折,点A的对称点为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d670910fa2d2953a760eb61a202f5244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b6c8d19a06f7a6cedfb0f4ec1ea4d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97469dafabe980c0447732fe4e33898b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)求点D的坐标;
(3)当点M,N同时开始运动时,若以点M,D,C为顶点的三角形与以点B,O,N为顶点的三角形相似,求t的值;
(4)过点D与x轴平行的直线,交抛物线的对称轴于点Q,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e9500060dec5abbea05438b3bb66e3.png)
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