已知四边形
中,
,
分别是
,
边上的点,
与
交于点
,令
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/25/59be97f6-b291-415d-85cd-70adb5a5bcd6.png?resizew=485)
特例解析:如图1,若四边形
是矩形,且
,求证:
;
类比探究:如图2,若四边形
是平行四边形,当
与
满足什么关系时,
仍然成立?并证明你的结论;
拓展延伸:如图3,在(2)的条件下,若
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aca6ad6a8cee27ee318c1a4fa443b2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/25/59be97f6-b291-415d-85cd-70adb5a5bcd6.png?resizew=485)
特例解析:如图1,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c61ed1ed1bfd0fea288d61425f1867db.png)
类比探究:如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a8e30f70325b5b14851b9377107ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c61ed1ed1bfd0fea288d61425f1867db.png)
拓展延伸:如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a120e186030ca3ac6987ce80b9fb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5121ba0251bba181fc1880368e5e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd32d2db65c6c30f0981cf6b21ab94bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2020-06-27 18:39:24
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图(1),在平面直角坐标系中,点A,B的坐标分别为(﹣1,0),(3,0),将线段AB先向上平移2个单位长度,再向右平移1个单位长度,得到线段CD,连接AC,BD.
(1)求点C、点D的坐标及S四边形ABDC;
(2)点Q在y轴上,且S△QAB=S四边形ABDC,求出点Q的坐标;
(3)如图(2),点P是线段BD上任意一个点(不与B、D重合),连接PC、PO,试探索∠DCP、∠CPO、∠BOP之间的关系,并证明你的结论.
(1)求点C、点D的坐标及S四边形ABDC;
(2)点Q在y轴上,且S△QAB=S四边形ABDC,求出点Q的坐标;
(3)如图(2),点P是线段BD上任意一个点(不与B、D重合),连接PC、PO,试探索∠DCP、∠CPO、∠BOP之间的关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606958601756672/2613560187043840/STEM/42390503-6622-4043-82a8-5df500775a64.png?resizew=353)
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【推荐2】综合与实践
如图1,在正方形
中,点
,
分别是边
,
上的点,且
.
(1)求证:
.
(2)如图2,在图1的基础上,过点
作
的垂线,与正方形
的外角
的平分线交于点
,连接
.求证:四边形
是平行四边形.(提示:在
上截取
,连接
)
(3)如图3,连接
,若四边形
的面积是9,
,则直接写出
的长.
如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/e3cb4323-260d-4ee8-9714-195e89d3c8b1.png?resizew=528)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)如图2,在图1的基础上,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7eefad280b3c7c7db88ac005c7e583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87beed01da92e87c9934770c77d12c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76956e451ab7fd18f473503c3745187d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87beed01da92e87c9934770c77d12c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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真题
【推荐3】问题提出
(1)如图1,在
中,
,
,
,E是
的中点,点F在
上且
求四边形
的面积.(结果保留根号)
问题解决
(2)某市进行河滩治理,优化美化人居生态环境.如图2所示,现规划在河畔的一处滩地上建一个五边形河畔公园
按设计要求,要在五边形河畔公园
内挖一个四边形人工湖
,使点O、P、M、N分别在边
、
、
、
上,且满足
,
.已知五边形
中,
,
,
,
,
.满足人工湖周边各功能场所及绿化用地需要,想让人工湖面积尽可能小.请问,是否存在符合设计要求的面积最小的四边形人工湖
?若存在,求四边形
面积的最小值及这时点
到点
的距离;若不存在,请说明理由.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0ee3db4954e8858303c2ef19307e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
问题解决
(2)某市进行河滩治理,优化美化人居生态环境.如图2所示,现规划在河畔的一处滩地上建一个五边形河畔公园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0402c7e8ed10c0d1c56c318fb58e69b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176377e26b6defa8cbd1af93186c12bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1feef5fae8f9e744c70a09778205a5f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4dec02850a02a8da56514ffffba952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0425abc0a23299964ede59c6a0732743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117f14c4e5e93932ae3530c41a9d5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c436ae7f37b71d6e9587428d116e1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614bfcee81719d5abea7b01bfac17bc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0402c7e8ed10c0d1c56c318fb58e69b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0402c7e8ed10c0d1c56c318fb58e69b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747984680165376/2748434046091264/STEM/8fb591f7-c69c-470d-9671-5e841ba58563.png?resizew=685)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,在
中,
,AH是BC边上的高,点D是直线AH上一个动点,将线段DC绕点D顺时针旋转
(
),且
,得到线段DE,连结EC,EB,直线AH和直线BE相交于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979386654851072/2980499471286272/STEM/39f31ed0-3402-4478-870e-db68fdc3dc8a.png?resizew=547)
(1)如图①,当
时,线段AD与BE的比值是_________;直线AD与BE所夹锐角是_________
;
(2)如图②,当
时,(1)中的两个结论是否仍然成立?若成立,请仅就图②中的情形进行证明;否测,请说明理由;
(3)如图③,若当
时,
,请直接写出EF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165654f64dcc343721d53b85cac3cf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979386654851072/2980499471286272/STEM/39f31ed0-3402-4478-870e-db68fdc3dc8a.png?resizew=547)
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
(3)如图③,若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c120b32902776fcec1b501550a4e2749.png)
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【推荐2】如图,△ABC中,AB=AC,以AC为直径的⊙O与边AB、BC分别交于点D、E.过E的直线与⊙O相切,与AC的延长线交于点G,与AB交于点F.
(1)求证:△BDE为等腰三角形;
(2)求证:GF⊥AB;
(3)若⊙O半径为3,DF=1,求CG的长.
![](https://img.xkw.com/dksih/QBM/2017/5/31/1698922734444544/1699591607484416/STEM/a6386f87cc2340398189c4f9ce7b6bbd.png?resizew=198)
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【推荐3】【问题背景】如图1,在
中,
,点E在
上,
,
.四边形
是正方形,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/60ee5f73-900f-4bea-b1cd-3735afdfb650.png?resizew=520)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/50c0ba35-d115-461c-97cf-53670885e0d3.png?resizew=284)
(1)【问题发现】如图2,小芳发现,只要将
绕点E逆时针旋转一定的角度到达
,就能将阴影部分转化到一个三角形里,从而轻松解答.根据小芳的发现,可求出图1中阴影部分的面积为 ;(直接写出答案)
(2)【类比探究】如图3,在四边形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a5ce4cf21507ff36fe30ff6f678ba.png)
于点E,若
的长为6,试求出四边形
的面积.
(3)如图4,在正方形
中,点E,F分别在正方形
的边
上,
,连接
,猜想
之间满足的数量关系,并说明理由.
(4)【拓展应用】如图5,在矩形
中,
,点E、F分别在边
上,
,连接
,则
的长为 (直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fd368efb51a5ae90c0f3e276704d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/60ee5f73-900f-4bea-b1cd-3735afdfb650.png?resizew=520)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/50c0ba35-d115-461c-97cf-53670885e0d3.png?resizew=284)
(1)【问题发现】如图2,小芳发现,只要将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c7b5b9b9010edefd06be8a0e7296c.png)
(2)【类比探究】如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a5ce4cf21507ff36fe30ff6f678ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图4,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720da9a99954c5516beb3422e94a22b0.png)
(4)【拓展应用】如图5,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e20a58b0f3828850a767de4a906c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337cde5043acf3844d6e003267c03f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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较难
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,AC=8,BC=6,CD是斜边上中线,点E为边AC上一动点,点F为边BC上一动点(不与B,C重合),且∠EDA=∠FDB.
(1)求AB的长;
(2)若DE∥BC,求CF的长;
(3)连结EF、DC交于点G,试问在点E运动的过程中,是否存在某一位置使CG=GF,若存在,请求出
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930340905598976/1931522605498368/STEM/2fa51bef6eaf4bbfbbf5e964193deb82.png?resizew=266)
(1)求AB的长;
(2)若DE∥BC,求CF的长;
(3)连结EF、DC交于点G,试问在点E运动的过程中,是否存在某一位置使CG=GF,若存在,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c396ff7b55ccd59f5d5e184abd1d99b.png)
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930340905598976/1931522605498368/STEM/2fa51bef6eaf4bbfbbf5e964193deb82.png?resizew=266)
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930340905598976/1931522605498368/STEM/af9d905a67ed45b8aaf314dae5a47a7d.png?resizew=266)
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解题方法
【推荐2】在正方形
中,点
是射线
上一个动点.连接
,
,点
,
分别为
,
的中点,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/4/15/2442160217882624/2442629992595456/STEM/a153f38d-c130-4717-8306-82233890777a.png)
(1)如图 1,当点
在线段
的延长线上时,请判断
的形状,并说明理由.
(2)如图 2,正方形 的边长为 4,点
与点
关于直线
对称,且点
在线段
上.连接
,若点
恰好在直线
上,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd412e8dcc46e8155c675f5656bd316.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd412e8dcc46e8155c675f5656bd316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45b3119e3afc81be5e3be1795905c29.png)
![](https://img.xkw.com/dksih/QBM/2020/4/15/2442160217882624/2442629992595456/STEM/a153f38d-c130-4717-8306-82233890777a.png)
(1)如图 1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc3b5c742279d878e9a25f2c8e3b86f.png)
(2)如图 2,正方形 的边长为 4,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ee4a2510c4c5091513b3ab2dca6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45b3119e3afc81be5e3be1795905c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ee4a2510c4c5091513b3ab2dca6f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f787a603029753885e42a7fc6a58131.png)
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名校
解题方法
【推荐3】如图1,抛物线
交
轴于A、B两点(点A位于点B的左侧),交y轴于点C.直线
交y轴于点E,交抛物线于A、D两点. P为直线
下方抛物线上一动点,点M、点N为直线
上的两个动点.
(1)求S△ACD;
(2)如图2,当PM
y轴时,求PM+PN的最大值及对应的点P的坐标;
(3)如图3,将抛物线
沿射线AD平移一定的距离得到新的抛物线
,使得新抛物线
过点D,点F为新抛物线
的顶点,点G为抛物线
上的一动点.当以F、G、M、N为顶点的四边形为平行四边形时,请直接写出所有符合条件的点G的坐标.
![](https://img.xkw.com/dksih/QBM/2021/4/11/2697627681628160/2702379699027968/STEM/d8925984-4018-4a8b-9411-e21c2cdd65b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2571a6b841906ea0607e3188bcfa03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccfc7c63e79bc319dc92b8d284914e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(1)求S△ACD;
(2)如图2,当PM
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(3)如图3,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2571a6b841906ea0607e3188bcfa03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2571a6b841906ea0607e3188bcfa03.png)
![](https://img.xkw.com/dksih/QBM/2021/4/11/2697627681628160/2702379699027968/STEM/d8925984-4018-4a8b-9411-e21c2cdd65b9.png)
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解答题-证明题
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较难
(0.4)
解题方法
【推荐1】已知∠B为△ABC的内角,且sinB与cosB恰好为方程mx2-mx+p-4=0的两根,以AB为直径的⊙O交AC于 D,取BC的中点E,经过A、B、E的⊙O′交直线DE于F,如图,连接AF.
(1)求证:EF为⊙O的切线;
(2)求证:AD2=AF• AB;
(3)若⊙O的半径R=p,且 AD:CD=2:3,求弦EF的长及tan∠ ABF.
(1)求证:EF为⊙O的切线;
(2)求证:AD2=AF• AB;
(3)若⊙O的半径R=p,且 AD:CD=2:3,求弦EF的长及tan∠ ABF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/ae571a30-7332-482a-b924-43413890da00.png?resizew=148)
您最近一年使用:0次
解答题-证明题
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较难
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【推荐2】已知:点O在
的边
上,以
为半径的
与
分别相切于点C,D,与
交于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/6d383e69-8d4e-4d55-8a43-025bcd299778.png?resizew=425)
(1)如图1,求证:
;
(2)如图2,
,求
的值;
(3)如图3,在(2)的条件下,连接
,作弦
,连接
交
于点G,作直径
,连接
,若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b672b5fe9c1065df3a87de73ea15e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/6d383e69-8d4e-4d55-8a43-025bcd299778.png?resizew=425)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af37c673677edb356f9cb9e9dfd0ce8.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acd0d0090f9bb568519f5cf41475549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324e464fecd30ea2eef67e934be0f288.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a2396d052b399cd86f67c925f6aecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fc64a6b3e71b23a5ccb371967edfd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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