已知菱形
中,点E是对角线
上一点,点F是边
上一点,连接
、
、
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/945d87d3-1231-4066-ab2c-264fec832a1f.png?resizew=504)
【特例探究】
(1)如图1,若
且
,线段
、
满足的数量关系是________;
(2)如图2,若
且
,判定线段
、
满足的数量关系,并说明理由;
(3)【一般探究】如图3,根据特例的探究,若
,
,请求出
的值(用含
的式子表示);
(4)【发现应用】如图3,根据“一般探究”中的条件,若菱形边长为1,
,点F在直线
上运动,则
面积的最大值为________,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/945d87d3-1231-4066-ab2c-264fec832a1f.png?resizew=504)
【特例探究】
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【一般探究】如图3,根据特例的探究,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269126dce7e64dfc6e9b5ad28717c782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(4)【发现应用】如图3,根据“一般探究”中的条件,若菱形边长为1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffbc3721d9446258408b9c21c222b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
2023·江苏扬州·一模 查看更多[3]
更新时间:2023-04-20 08:34:42
|
相似题推荐
解答题-证明题
|
困难
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真题
【推荐1】如图1,已知正方形ABCD的边长为1,点E在边BC上,若∠AEF=900,且EF交正方形外角的平分线CF于点F
![](https://img.xkw.com/dksih/QBM/2013/7/23/1573670767706112/1573670774071296/STEM/6e41fd596e9a4d228ac9669917fa7814.png?resizew=390)
(1)图1中若点E是边BC的中点,我们可以构造两个三角形全等来证明AE=EF,请叙述你的一个构造方案,并指出是哪两个三角形全等(不要求证明);
(2)如图2,若点E在线段BC上滑动(不与点B,C重合).
①AE=EF是否总成立?请给出证明;
②在如图2的直角坐标系中,当点E滑动到某处时,点F恰好落在抛物线
上,求此时点F的坐标.
![](https://img.xkw.com/dksih/QBM/2013/7/23/1573670767706112/1573670774071296/STEM/6e41fd596e9a4d228ac9669917fa7814.png?resizew=390)
(1)图1中若点E是边BC的中点,我们可以构造两个三角形全等来证明AE=EF,请叙述你的一个构造方案,并指出是哪两个三角形全等(不要求证明);
(2)如图2,若点E在线段BC上滑动(不与点B,C重合).
①AE=EF是否总成立?请给出证明;
②在如图2的直角坐标系中,当点E滑动到某处时,点F恰好落在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f0f02bd5ae54facfb6ba62f5d7af0b.png)
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【推荐2】已知抛物线
的对称轴是直线
且与
轴相交于
两点,与
轴交于点
点
的坐标为
.
求抛物线的解析式;
若点
是第一象限内抛物线上一点,过点
作直线
轴于点
交直线
于点
当
时,求四边形
的面积.
在
的条件下,若点
在抛物线上,点
在抛物线的对称轴上,当以点
为顶点的四边形是平行四边形时,求出所有符合条件的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228c948452192bb5b78a64ea9086b67b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16131962b9a97450f713b552addaec50.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f7606459554b3a362dd12f9f7faec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b62ea7de9572d6c8e7fcdf03af761f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](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/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e4ca8b58be33aa0b01f29308367f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5c664aa79a88c035d7ece15220a4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8110b55b9e80c257b859a73e076b906d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b17d8833061f65ab3e885514cf9458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4670c393189e3eb065eb3153f0bf34ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】在菱形
中,
,
,动点
在射线
上运动.
绕着点
顺时针旋转
,得到对应点
连接
,
.求证:
;
(2)如图2,在(1)条件下,若射线
经过
边中点
,求
的值;
(3)连接
,将线段
绕着点
逆时针旋转一个固定角
,
,点
落在点
处,射线
交射线
于点
,若
是等腰三角形,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854e1892c4df407beb990ceed492bdae.png)
(2)如图2,在(1)条件下,若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98d96882d2f6a76ceb019705c0ba224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234cdeeee94033501fca6596894f7b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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【推荐2】如图,
是等边三角形,D为
上一点,连接
,将
绕点C顺时针旋转120°至
,连接
,分别交
、
于点F、G.
(1)若
,
,求
的面积;
(2)请猜想线段
,
,
之间的数量关系,并证明你的猜想;
(3)当
周长最小时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/387d0b00-e8a6-4d07-aea5-b6925c3d77b7.png?resizew=601)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(2)请猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79835728d485d8e2480586f8912bf0db.png)
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名校
【推荐1】如图,在平面直角坐标系中,直线
与
轴交于点
,与
轴交于点
,
.
(1)求直线
的解析式;
(2)如图1,点
是线段
上一点,点
是线段
上一点,
,连接
、
,设点
的纵坐标为
,
的面积为
,求
与
的函数关系式(不要求写出自变量
的取值范围);
(3)如图
,在(2)的条件下,
,点
在线段
上,连接
,
,点
在线段
上,连接
、
,将
沿着直线
折叠得到
,
交线段
于点
,若
的面积等于
的面积的
,
为锐角,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b866297573eebca4c3537aadb71726a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0faa95c3b19a4e017263c8ed8b9038e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/35eb9546-b6e8-42d1-8b5f-32f18baa067d.png?resizew=390)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43c3c35710bb8d350c0a2335b62bf98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ececddb0bd835b377e5428a91b5273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4aa6359e027e952a897435224044db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50efda6659461c7482e106c5b1774072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.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/2e310ac26049fd114f77837f60938a17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca8b26c3ad6d892590290a2304126bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】如图1,在平面直角坐标系中,O为坐标原点,点A、B为抛物线y=
上的两个动点,且OA⊥OB.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/fcebf68c-ad1f-4733-9726-ecbf6995319e.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/3aef05c9-d38e-4b87-bb99-8356ca2b1fe7.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/2a45467d-5da6-4c9d-9c9a-8545da8f6b81.png?resizew=192)
(1)若点B的坐标是(2,m),则点A的坐标是 ;
(2)过点B作BC⊥x轴,垂足为C,若△AOB与△OBC相似,求cos∠OBA.
(3)在(1)问的条件下,若点E为二次函数第一象限内抛物线上一动点,EH垂直于X轴于点H,交线段AB于点F,以EF为直径的圆M与AB交于点R,求当△EFR周长取最大值时E点的坐标;
(4)在(3)问的条件下,以BH为直径作圆N,点P为圆N上一动点,连接AP,Q为AP上一点且
,连接HQ,求OQ的最小值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/fcebf68c-ad1f-4733-9726-ecbf6995319e.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/3aef05c9-d38e-4b87-bb99-8356ca2b1fe7.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938909791289344/2963761081753600/STEM/2a45467d-5da6-4c9d-9c9a-8545da8f6b81.png?resizew=192)
(1)若点B的坐标是(2,m),则点A的坐标是 ;
(2)过点B作BC⊥x轴,垂足为C,若△AOB与△OBC相似,求cos∠OBA.
(3)在(1)问的条件下,若点E为二次函数第一象限内抛物线上一动点,EH垂直于X轴于点H,交线段AB于点F,以EF为直径的圆M与AB交于点R,求当△EFR周长取最大值时E点的坐标;
(4)在(3)问的条件下,以BH为直径作圆N,点P为圆N上一动点,连接AP,Q为AP上一点且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f18641712cdba4f37e9dda9bb9163e.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
【推荐3】如图,平面直角坐标系xOy中,矩形OABC的顶点A,C分别在x轴,y轴的正半轴上,且点C的坐标是(0,1),点B的坐标是(
,1),抛物线y=﹣x2+bx+c经过点B和点C.
(1)求抛物线y=﹣x2+bx+c的表达式:
(2)将△OAC沿直线AC折叠,点O的对称点记为点D,请判断:点D是否在抛物线上?并说明理由;
(3)点E为线段AC上的一个动点.
①若点P在抛物线上,其横坐标为m,当PE⊥AC且PE=
时.请直接写出m的值;
②若点F为线段AB上一个动点,且CE=AF,当OE+OF的值最小时,请直接写出点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求抛物线y=﹣x2+bx+c的表达式:
(2)将△OAC沿直线AC折叠,点O的对称点记为点D,请判断:点D是否在抛物线上?并说明理由;
(3)点E为线段AC上的一个动点.
①若点P在抛物线上,其横坐标为m,当PE⊥AC且PE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
②若点F为线段AB上一个动点,且CE=AF,当OE+OF的值最小时,请直接写出点F的坐标.
![](https://img.xkw.com/dksih/QBM/2019/4/7/2177299581657088/2179360756326400/STEM/b098a0998e1a4ac18ecd9c1e256d2091.png?resizew=206)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】在
中,
,
,
,E是线段
上一动点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/c8c1dd75-bde0-40e1-a2f8-fbf414cdc8eb.png?resizew=622)
(1)如图1,若
,求
的面积;
(2)如图2,若
,将线段
绕C逆时针旋转
得到线段
,连接
.若点G是线段
的中点,过点G作
交
于点P,交
于点H,证明
;
(3)如图3,将
沿
翻折至
,连接
.D是线段
上的点,且
,直接写出当
取得最小值时
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/c8c1dd75-bde0-40e1-a2f8-fbf414cdc8eb.png?resizew=622)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa5357d8bbc8778d64cd38cff09ceb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8935ff1dde389e0c6fd375efce6f6514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43cede3f894d03c72fd1c166ec0f82ad.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c3c8bf858c13b295de56e548116db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2452627c4f1e58eaa74484d85feccd5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a81346dcab6835bb87bf15306e7bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】平面直角坐标系中,四边形ABCO是菱形,点C的坐标为(﹣3,4),点A在x轴的正半轴上,O为坐标原点,连接OB,抛物线y=ax2+bx+c经过C、O、A三点.
(1)直接写出这条抛物线的解析式;
(2)如图1,对于所求抛物线对称轴上的一点E,设△EBO的面积为S1,菱形ABCO的面积为S2,当S1≤
S2时,求点E的纵坐标n的取值范围;
(3)如图2,D(0,﹣
)为y轴上一点,连接AD,动点P从点O出发,以
个单位/秒的速度沿OB方向运动,1秒后,动点Q从O出发,以2个单位/秒的速度沿折线O﹣A﹣B方向运动,设点P运动时间为t秒(0<t≤6),是否存在实数t,使得以P、Q、B为顶点的三角形与△ADO相似?若存在,求出相应的t值;若不存在,请说明理由.
(1)直接写出这条抛物线的解析式;
(2)如图1,对于所求抛物线对称轴上的一点E,设△EBO的面积为S1,菱形ABCO的面积为S2,当S1≤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(3)如图2,D(0,﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/78e6a87b-3ab0-4792-b1e7-57fa34a746f0.png?resizew=276)
您最近一年使用:0次