如图,在Rt△ABC中,∠BAC=90°,点D是BC的中点,以AD为直径作⊙O,分别与AB, AC交于点E,F点,过点E作EG⊥BC于G.
(1)求证 :EG是⊙O的切线;
(2)若AF=4,⊙O的半径为4.
①求BE的长.
②若
上有一个动点P,过点E作EQ⊥AP,垂足为Q,当动点P从D运动到F时,Q点所经过的路径长为 .
(1)求证 :EG是⊙O的切线;
(2)若AF=4,⊙O的半径为4.
①求BE的长.
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb53e0fdf3ebeb96e4f69feacbd80e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/ea4ab12b-9b44-4500-9b34-a34ad8f7aa59.png?resizew=221)
更新时间:2020-12-21 12:57:32
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解答题-问答题
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【推荐1】已知二次函数
的图像过点
,且对任意实数
,都有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001d187e69d9b1f979d04fd4a1200887.png)
(1)求该二次函数的解析式;
(2)若(1)中的二次函数的最低点为点T,点A、B为该二次函数上的两个动点,且
.连接点A、B,过点T作
,求点C到二次函数对称轴距离的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001d187e69d9b1f979d04fd4a1200887.png)
(1)求该二次函数的解析式;
(2)若(1)中的二次函数的最低点为点T,点A、B为该二次函数上的两个动点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e89cf53f33a239867d760e5faaf7e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27632e1f67258ff686533f03ae7518c.png)
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【推荐2】如图1,菱形
中,
,
,
是边
上一动点(不与点
重合),连接
,点
关于直线
的对称点为
,连接
并延长交直线
于点
是
的中点,连接
.
(1)填空:
______,
______(用含
的代数式表示);
(2)如图2,当
,题干中其余条件均不变,连接
.求证:
.
(3)(2)的条件下,连接
.
①若动点
运动到边
的中点处时,
的面积为______.
②在动点
的整个运动过程中,
面积的最大值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6988b81937a2b98659c359d9ed686146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.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/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d7ef454aa07765aeea22895988b2fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be11c1c2b55c264113d394c688dcc2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/2c7c1db8-6e79-4c42-ab71-b8756606ee7d.png?resizew=399)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01d86fdb9a738accc9d8464f5e0219e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f271031a3b20308a992fccc4a486752b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479e1863213f0bcf2d08511fdbedbf2.png)
(3)(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①若动点
![](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/8545c7ec378be8ad759c608e16ae9183.png)
②在动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8545c7ec378be8ad759c608e16ae9183.png)
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【推荐1】如图,以线段
为直径作
,交射线
于点
,
平分
交
于点
,过点
作直线
于点
,交
的延长线于点
,连接
.
(1)求证:直线
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/23633635-c5e0-401c-a765-a5ebe2bd1161.png?resizew=266)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99256fcfc0f71e0e8992c2cf40b93cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图,在中,
,点C是
中点,
与
分别相交于点D,E,延长
交
于点F,
,连接
.
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e5ce9f1dc208584786e91f7833256e.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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【推荐1】如图,已知
是
的直径,点C、D在
上,点E在
外.
(1)当
.
①
______度;
②求证:
是
的切线;
③当
时,求劣弧
的长.
(2)若
,H是
的中点,点D是一动点,当点D从点A按逆时针方向移动第一次到达点B时,请直接写出 点H移动的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/f99d2241-acc9-494f-aed8-72e148aafc46.png?resizew=171)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049a02e104a6f3146f9b6303fdf59693.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图1,在矩形ABCD中,点E、F分别是边AD、BC上的动点,且
,连接EF,将矩形ABCD沿EF折叠,点C落在点G处,点D落在点H处,直线EH与边BC所在直线相交于点P.设AE长为x,点E、F间的距离的平方为y,y与x的函数图像如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/f93c4d3f-e79c-4913-98aa-d36b1656e8f9.png?resizew=269)
(1)
______,
______,直接写出图1中,PE与PF的数量关系______;
(2)如图3,当点P在线段CB的延长线上时,GH交AB于点M,求证:点M在线段EF的垂直平分线上;
(3)在点E由点A移动到AD中点的过程中,计算出点G运动的路线长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/f93c4d3f-e79c-4913-98aa-d36b1656e8f9.png?resizew=269)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
(2)如图3,当点P在线段CB的延长线上时,GH交AB于点M,求证:点M在线段EF的垂直平分线上;
(3)在点E由点A移动到AD中点的过程中,计算出点G运动的路线长.
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【推荐1】已知抛物线
(
是常数),顶点为
.
(1)若抛物线
经过点
;
①求抛物线
的解析式及顶点坐标;
②若将抛物线
向上平移8个单位长度,再向左平移2个单位长度,得抛物线
.点
的横坐标为
,且点
在抛物线
上,若抛物线
与
轴交于点
,连接
,
为抛物线
上一点,且位于线段
的上方,过点
作
轴于点
,
交
于点
,若
,求点
的坐标;
(2)已知点
,且无论
取何值,抛物线
都经过定点
,当
时,求抛物线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95447a279b6bd6b3f64806fcb8c22ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b5d16f1ead64356b61a3fd7fb024ef.png)
①求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
②若将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2634263d383b0487281fdcf6fe3cc625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0605b1f23461e980f27ef18550676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b11bfae89a72aa67d03461fa1df1502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f6c2363ebf4b0a5c59ed132d0922f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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【推荐2】如图,在平面直角坐标系
中,矩形
的边
,
.若不改变矩形
的形状和大小,当矩形顶点
在x轴的正半轴上左右移动时,矩形的另一个顶点
始终在
轴的正半轴上随之上下移动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/b1c7a600-694b-4e07-b9be-7b869796da79.png?resizew=431)
(1)当
时,求点
的坐标;
(2)设
的中点为
,连接
,当四边形
时,求四边形
的面积;
(3)当点
移动到某一位置时,点
到点
的距离有最大值,请直接写出最大值.并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/b1c7a600-694b-4e07-b9be-7b869796da79.png?resizew=431)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cfa68fa769a24b3cf2503695d9d897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c77e91d68c55b22830a23a8f1407732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5cb5d38eaae90d55a4d5d1b643ad3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e80a65a1c6476f3200505173186684.png)
(3)当点
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c50340e916f8eebd084a73deb02edf8.png)
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