已知在平面直角坐标系xOy中,O是坐标原点,以P(1,1)为圆心的⊙P与x轴,y轴分别相切于点M和点N,点F从点M出发,沿x轴正方向以每秒1个单位长度的速度运动,连接PF,过点PE⊥PF交y轴于点E,设点F运动的时间是t秒(t>0)
(1)若点E在y轴的负半轴上(如图所示),求证:PE=PF;
(2)在点F运动过程中,设OE=a,OF=b,试用含a的代数式表示b;
(3)作点F关于点M的对称点F′,经过M、E和F′三点的抛物线的对称轴交x轴于点Q,连接QE.在点F运动过程中,是否存在某一时刻,使得以点Q、O、E为顶点的三角形与以点P、M、F为顶点的三角形相似?若存在,请直接写出t的值;若不存在,请说明理由.
(1)若点E在y轴的负半轴上(如图所示),求证:PE=PF;
(2)在点F运动过程中,设OE=a,OF=b,试用含a的代数式表示b;
(3)作点F关于点M的对称点F′,经过M、E和F′三点的抛物线的对称轴交x轴于点Q,连接QE.在点F运动过程中,是否存在某一时刻,使得以点Q、O、E为顶点的三角形与以点P、M、F为顶点的三角形相似?若存在,请直接写出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2014/10/8/1573751835107328/1573751841505280/STEM/96ff4ea3df324e5a81fe348786651c70.png)
更新时间:2019-01-30 18:14:09
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相似题推荐
解答题-问答题
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困难
(0.15)
【推荐1】如图,直线
交x轴于点A,交y轴于点B,抛物线
经过点A、E,点E的坐标是
,抛物线交x轴于另一点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/f0ea4644-a4fc-4494-8871-7299cf82026c.png?resizew=237)
(1)求抛物线的解析式.
(2)设抛物线的顶点为D,连接
,动点P在
上以每秒2个单位长度的速度由点B向点D运动,同时动点Q在线段
上以每秒3个单位长度的速度由点C向点A运动,当其中一个点到达终点停止运动时,另一个点也随之停止运动,设运动时间为t秒,
交线段
于点H.
①当
时,求t的值;
②过点H作
,垂足为点M,过点P作
交线段
或
于点N.在点P、Q的运动过程中,是否存在以点P,N,H,M为顶点的四边形是矩形?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de869ae6b6dc5b79fcae3de540b30bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad246c8f288d46b068f1f8e2fdbd29b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594b018c05e4b90e745b6c8fa19a8330.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/f0ea4644-a4fc-4494-8871-7299cf82026c.png?resizew=237)
(1)求抛物线的解析式.
(2)设抛物线的顶点为D,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9844d0134a20b2500bb681941c2b8a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d03428e9d5de72e797e5083da306d6c4.png)
②过点H作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5ab40a8535a1189cd4acad91dad24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae7b8876cefd4f32d85ec5676e89f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,在矩形
中,
,点
从点
出发,沿
向点
匀速运动,速度为每秒1个单位,过点
作
,交对角线
于点
.点
从点
出发,沿对角线
向点
匀速运动,速度为每秒1个单位.
、
两点同时出发,设它们的运动时间为
秒(
).
(1)当
时,求出
的值;
(2)连接
,当
时,求出
的值;
(3)试探究:当
为何值时,
是等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1844834ef0315a704d8e2fba77544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052fc4d2a1d08dc58e6264f32a859f6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbdf8648ebbc56720ec14fd91159906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4aff6a142ebc6c08bf803104b2759bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)试探究:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1fa5d37fc136489cb494310fc2825f.png)
![](https://img.xkw.com/dksih/QBM/2018/6/10/1964019786186752/1966157134299136/STEM/ff00b46cae074dec85d771ef898e5424.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2018/6/10/1964019786186752/1966157134299136/STEM/1430101c0a63498d8d288d5bb4771b17.png?resizew=241)
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解答题-证明题
|
困难
(0.15)
【推荐1】如图1,四边形
内接于
,对角线
,
相交于点E,且
.
(1)求证:
;
(2)若
,
,求
的长度;
(3)如图2,连接
交
与点F,
,
,求
的半径长度;
(4)如图3,若
,延长
至点F,若
平分
,记
的面积为
,
面积为
,
面积为
,若
,则
是否为定值?若是,请求出这个定值;若不是,说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/bac9d552-8e1d-466c-8f23-7b34037141c3.png?resizew=475)
(1)求证:
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
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(3)如图2,连接
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(4)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-问答题
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(0.15)
【推荐2】已知:如图,
与
轴交于
两点,圆心
的坐标为
的半径为
,过点
作
的切线交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/eee8f472-5289-4acc-8f6c-7143552e63e5.png?resizew=448)
(1)点
的坐标是为(____,____),切线
的解析式为_________;
(2)若点
是第一象限内
上一点,过点
作
的切线与直线
相交于点
,且
,求点
的坐标;
(3)向左移动
(圆心
始终保持在
上),与直线
交于
,在移动过程中是否存在点
,使得
是直角三角形?若存在,求出点
的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428426e7f2ee0502b555a87a5cef6cb7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/eee8f472-5289-4acc-8f6c-7143552e63e5.png?resizew=448)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.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/3f590c49800742a6d1c7578f4e9f0acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(3)向左移动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b96774a604d934f1252019b7318e3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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