已知在
中,
.
(1)如图1,在
的延长线上取点D,连接
,在
上取点E,连接
交
于点P,
.求证:
;
(2)如图2,点D在
上,连接
,G为
的中点,连接
,
,
,
的中垂线交
于点E,连接
并延长交
于点F.求证:
;
(3)如图3,过点A作
的平行线
,连接
,
,过点A作
于点E.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/017cecff-7b73-4f06-bef0-8fed1f0acb6a.png?resizew=393)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6344f71dcbc7083f7824b2097ebcdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf771984d17a4d9972356be322635742.png)
(2)如图2,点D在
![](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/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a51ed1fa725fd483e7379e614a9bc85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc250ed54df5ddf2308cf61766f37ffd.png)
(3)如图3,过点A作
![](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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc29b0c8fee4a4fab769f53780f30a0.png)
2023·重庆·模拟预测 查看更多[1]
更新时间:2024-03-26 22:03:29
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】正方形ABCD边长为6,点E在边AB上(点E与点A、B不重合),点F、G分别在边BC、AD上(点F与点B、C不重合),直线FG与DE相交于点H.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901508412833792/2902204857237504/STEM/80df5f88bd2e4fe19edf450b060673ab.png?resizew=550)
(1)如图1,若∠GHD=90°,求证:GF=DE;
(2)在(1)的条件下,平移直线FG,使点G与点A重合,如图2.联结DF、EF.设CF=x,△DEF的面积为y,用含x的代数式表示y;
(3)如图3,若∠GHD=45°,且BE=2AE,求FG的长.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901508412833792/2902204857237504/STEM/80df5f88bd2e4fe19edf450b060673ab.png?resizew=550)
(1)如图1,若∠GHD=90°,求证:GF=DE;
(2)在(1)的条件下,平移直线FG,使点G与点A重合,如图2.联结DF、EF.设CF=x,△DEF的面积为y,用含x的代数式表示y;
(3)如图3,若∠GHD=45°,且BE=2AE,求FG的长.
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【推荐2】在
中,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/2c4afb6a-a9e5-485d-b11f-f382ea03ea04.png?resizew=385)
(1)如图①,当
,
为
的角平分线时,在
上截取
,连接
,易证
.请证明
;
(2)①如图②,当
,
为
的角平分线时,线段
又有怎样的数量关系?请直接写出你的结论,不要求证明;
②如图③,当
,
为
的外角平分线时,线段
又有怎样的数量关系?请写出你的猜想并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b903796831a684296f24e836b1fa7770.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/2c4afb6a-a9e5-485d-b11f-f382ea03ea04.png?resizew=385)
(1)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0f9b89a7247a40dd5898a0ec0492e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0f9b89a7247a40dd5898a0ec0492e9.png)
(2)①如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c44fc4836a86d5c24c20e6807eec9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec863999b1974aabb6dc67841765161.png)
②如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c44fc4836a86d5c24c20e6807eec9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec863999b1974aabb6dc67841765161.png)
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解题方法
【推荐1】如图1,平行四边形
的对角线
,
相交于点
,
边的垂直平分线
交
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735730842886144/2793755551014912/STEM/d0f5768c-1280-4c88-9b15-1642858b54bc.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735730842886144/2793755551014912/STEM/82358372-f007-4e4f-93ad-f03a0a08bd44.png?resizew=165)
(1)过点
作
交
于点
,求证:
;
(2)如图2,将
沿
翻折得到
.
①求证:
;
②若
,
,求
的长度.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735730842886144/2793755551014912/STEM/d0f5768c-1280-4c88-9b15-1642858b54bc.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735730842886144/2793755551014912/STEM/82358372-f007-4e4f-93ad-f03a0a08bd44.png?resizew=165)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e721cfc22f8c7bcbdca6bc127a852b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7720a24ccafd483cffe43b95be4ee20d.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ce578e782b9d21fde5f3c58822eb23.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1500e0edd2697b21435429dc25907df2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c99cdf6ad2f26dcc9326a345a987e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fc28f622892dd18bbbac95d541acfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,在矩形
中,
,
,
从点
开始沿
向终点
以
的速度移动,与此同时,点
从点
开始沿
边向点
以
的速度移动,如果
、
分别从
、
同时出发,当点
运动到点
时,两点停止运动,设运动时间是
.
(1)
为何值时,
在
的中垂线上?
(2)
为何值时,
的长度为
?
(3)是否存在
的值,使得五边形
的面积为
?若存在,请求出此时
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/b5432a7f-289a-4e5a-a1b4-d8cb508e3981.png?resizew=138)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a9561c615656ef59fe37ea568a7367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a9b6a360130532cf7ba3cba89dcda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】在
中,B在C的左边,
,将
关于
作轴对称,得四边形
.P是对角线
上的动点 ,E是直线
上的动点 ,且
.
如图1所示,四边形
是________(填“矩形”或“菱形”或“正方形”);
______
(填“
”或“
”);
(2)四边形
如图2所示,且
,四边形
是_______(填“矩形”或“菱形”或“正方形”);(1)中
与
之间的数量关系还成立吗?若成立,请说明理由.
(3)四边形
如图3所示,若
,
,请直接写出
的度数.(用含
、
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd0cc95217ffdaed3a7e50746683868.png)
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4144f6ce108867d237f6891b4f4954.png)
![](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/ce2b669a87f18866b2e9560f7fe1776d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411837b4b3078d05b43cb0439259a362.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2b669a87f18866b2e9560f7fe1776d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(3)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c029e4ab80f8a2080d59ba73841f364f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d0eec90f3f96578bca4054361614db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add18fdf2049abff08a687b950f1cc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
您最近一年使用:0次
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【推荐2】如图,在平面直角坐标系
中,四边形
是矩形,点
的坐标是
,点
为
边上的一动点(不与点
重合),连接
,过点
作直线
,交
于点
,在直线
上取一点
(点
在点
右侧),使得
,过点
作
,交
于点
,连接
,设
.
(1)填空:点
的坐标为______(用含
的代数式表示);
(2)判断线段
的长度是否随点
的位置的变化而变化?并说明理由;
(3)①当
为何值时,四边形
的面积最小,请求出最小值;
②在
轴正半轴上存在点
,使得
是等腰三角形,请直接写出3个符合条件的点
的坐标(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4f01a9a30051bdd7f8f20effb11556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce335408a2a7459f46f1c140c5fe20a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b742c104b16df4095747fc72ca8daef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0964facaa9ef7c22f16edfd3671574e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903e2d51a3a496bde2f5e8de020e351d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f2561a3f466e6351832ad7cfeda680.png)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708872199397376/2708910076633088/STEM/a4b2796b-cebd-4038-bd70-73d1b4e432ab.png)
(1)填空:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86da0e585058bc950c77346a1b1d9469.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,等腰△ABC中,已知AC=BC=2
, AB=4,作∠ACB的外角平分线CF,点E从点B沿着射线BA以每秒2个单位的速度运动,过点E作BC的平行线交CF于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/13/18f9a2ba-aea9-406f-9626-b3949f6348c7.png?resizew=169)
(1)求证:四边形BCFE是平行四边形;
(2)当点E是边AB的中点时,连接AF,试判断四边形AECF的形状,并说明理由;
(3)设运动时间为t秒,是否存在t的值,使得以△EFC的其中两边为邻边所构造的平行四边形恰好是菱形?不存在的,试说明理由;存在的,请直接写出t的值.答:t=________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/13/18f9a2ba-aea9-406f-9626-b3949f6348c7.png?resizew=169)
(1)求证:四边形BCFE是平行四边形;
(2)当点E是边AB的中点时,连接AF,试判断四边形AECF的形状,并说明理由;
(3)设运动时间为t秒,是否存在t的值,使得以△EFC的其中两边为邻边所构造的平行四边形恰好是菱形?不存在的,试说明理由;存在的,请直接写出t的值.答:t=________.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】同学们学过正方形与等腰三角形发现它们都是轴对称图形,它们之间有很多相似,在正边形
中,E是对角线
上一点(不与点A、C重合),以
、
为邻边作平行四边形
,
交
于点M,连接
.
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879367494508544/2928823453786112/STEM/d5b333f6-f2d1-4fb1-8c84-6f0bf85cecd4.png?resizew=570)
(1)如图1,当
时,过点E作
交
于点F,连接
并延长交
于点H.
求证:
;
(2)在
中,
,
.过点A作直线
,点C关于直线
的对称点为点D,连接
,
直线
交直线
于点E.如图2,
①依题意补全图形;
②请用等式表示线段
,
,
之间的数量关系,并予以证明.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df4437ed8be04615d252257b30a3a38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879367494508544/2928823453786112/STEM/d5b333f6-f2d1-4fb1-8c84-6f0bf85cecd4.png?resizew=570)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a204256ed9b80c5146b8349675c163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3224eea0f01fdff8b9c258beffc50e.png)
(2)在
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
①依题意补全图形;
②请用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次