问题发现:(1)如图1,在
中,
分别在
上,若
,则
和
是顶角相等的等腰三角形,连接
,则
的数量关系是_______,
的数量关系是________.
拓展探究:(2)如图2,
和
均为等边三角形,点
在同一直线上,连接
.试求
的度数及线段
之间的数量关系.
解决问题:(3)如图3,
和
均为等腰直角三角形,
,点
在同一直线上,
为
中
边上的高,连接
.试求
的度数及线段
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f785e5f5bd2afcde4d8342c129cac095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e88ee337b7c9082f4fe84fd1752d55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4ac36776c96182950542d0719d1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
拓展探究:(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4817f6d025306bfcba653b4e8d4dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
解决问题:(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4817f6d025306bfcba653b4e8d4dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a4d33c513b5ecd9a9743047afe4062.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/b5732f84-1371-4b4a-b810-92d451ccf071.png?resizew=536)
更新时间:2022-03-10 15:09:56
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:在
和
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/8fa0a91e-abac-4dba-9d0a-b5a773214459.png?resizew=343)
(1)如图①,若
,求证:
.
(2)如图②,若
,则
与
间的等量关系式为__________,
的大小为__________(直接写出结果,不证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d61d283d8793aa3ff5aa22271f4fcbc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/8fa0a91e-abac-4dba-9d0a-b5a773214459.png?resizew=343)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fb8a2b0e080dcee63288441d62d127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2fd69563c02e29e32d752f055336bb.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/cb686e4f5e3938575bc547e849d5513f.png)
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解答题-证明题
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适中
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【推荐2】如图,在四边形
中,
,
,点
是
边上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/276f0f2d-d861-4adf-98c5-852b3664f3c1.png?resizew=203)
(1)求证:
;
(2)求证:
;
(3)如果
为
为
,则用含
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aee0ba9adb6080e3e4a133065d342f5.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/387cb1a9bbf3452f9ead3697ce02eb0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/276f0f2d-d861-4adf-98c5-852b3664f3c1.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d373bca2dbc6f00cbce456fb7218d5.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9e07d22a1c8b598aa21241b089fb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6641bee5cdd334e531cd522a9d9e13ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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解答题-作图题
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【推荐3】数学是一门充满乐趣、奥妙、又极具探索的学科,对一个人的思维也是一种“挑战”.几何图形更是变幻无穷,但只要我们借助图形的直观、特殊情形出发,逐步“从特殊到一般”进行探索,思路和方法自然就会显现出来.下面是一道探索几何图形中线段AE与DB数量关系的例子:已知,在等边三角形ABC中,点E在AB上,点D在CB的延长线上,且ED=EC.小强的思路是:
(1)【特例探索】如图1,当点E为AB的中点时,确定线段AE与DB的大小关系,请你直接写出结论:AE______DB(选填“>”、“<”或“=”).
(2)【特例引路】如图2,当点E为AB边上任意一点时,确定线段AE与DB的大小关系,请你直接写出结论并加以理由说明,格式如:答:AE_____DB(选填“>”、“<”或“=”);理由如下,过点E作EF∥BC交AC于点F.(请你将接下来的解答过程补充完整).
(3)【拓展延伸】在等边三角形ABC中,当点E在直线AB上(在线段AB外),点D在线段CB的延长线上时,同样ED=EC,若已知△ABC的边长为1,AE=2,则请你帮助小强求出CD的长.(请你画出相应图形,并简要写出求CD长的过程).
(1)【特例探索】如图1,当点E为AB的中点时,确定线段AE与DB的大小关系,请你直接写出结论:AE______DB(选填“>”、“<”或“=”).
(2)【特例引路】如图2,当点E为AB边上任意一点时,确定线段AE与DB的大小关系,请你直接写出结论并加以理由说明,格式如:答:AE_____DB(选填“>”、“<”或“=”);理由如下,过点E作EF∥BC交AC于点F.(请你将接下来的解答过程补充完整).
(3)【拓展延伸】在等边三角形ABC中,当点E在直线AB上(在线段AB外),点D在线段CB的延长线上时,同样ED=EC,若已知△ABC的边长为1,AE=2,则请你帮助小强求出CD的长.(请你画出相应图形,并简要写出求CD长的过程).
![](https://img.xkw.com/dksih/QBM/2021/7/28/2773715082338304/2777583436283904/STEM/4941f7e913904ca28ed16797ed0f97f2.png?resizew=475)
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适中
(0.65)
【推荐1】在
中,
,
,P为
上的一点(不与端点重合),过点P作
交
于点M,得到
.
时,P为
的中点时,
与
的数量关系为 ;
(2)【类比探究】如图2,当
时,
绕点A顺时针旋转,连接
,
,则在旋转过程中
与
之间的数量关系是否发生变化?请说明理由;
(3)【拓展延伸】在(2)的条件下,已知
,
,当
绕点A顺时针旋转至B,P,M三点共线时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f49554aa2ee3bb9d17afc643f83538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ededa0e19291b5b7eb9884af5bdeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b26de6134b6d3f5a81e2882a7d7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(2)【类比探究】如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b26de6134b6d3f5a81e2882a7d7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(3)【拓展延伸】在(2)的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784b26de6134b6d3f5a81e2882a7d7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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【推荐2】如图,在等边
中,点D、E分别为
、
边上的点,
.连接
、
相交于点F.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0533597752a0efee17b335e548a72.png)
(2)过A作
于点H,当
,
,
时,求线段
的长度.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/7be13ff8-a202-461d-81ea-f927844d9395.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f0533597752a0efee17b335e548a72.png)
(2)过A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc16a9467a6de4ff5cfccc4316ae871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51fe67e9937aeaec9f632942e0a62132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fdf4b8732da674adf78873b356a611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐3】[问题提出]在等腰
中,AB=BC,
,点D,E分别在边
,
上(不同时在点A),连接
,将线段DE绕点E顺时针旋转
,得到线段
,连接
,探究
与
的位置关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/ff81a16a-29ed-42d6-bba2-4865978a05b0.png?resizew=385)
(1)[问题探究]先将问题特殊化,如图1,点D,E分别与点B,C重合,直接写出
与
的位置关系;
(2)再探讨一般情形,如图2,证明(1)中的结论仍然成立.
[问题拓展]
(3)如图3,在等腰
中,
,
,D为
的中点,点E在边
上,连接
,将线段
绕点E顺时针旋转
,得到线段
,点G是点C关于直线
的对称点,若点G,D,F在一条直线上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268668e9f8a4479da0ca4291026e0f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ceaf03ee55cedf059c3e70410da9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/ff81a16a-29ed-42d6-bba2-4865978a05b0.png?resizew=385)
(1)[问题探究]先将问题特殊化,如图1,点D,E分别与点B,C重合,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)再探讨一般情形,如图2,证明(1)中的结论仍然成立.
[问题拓展]
(3)如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268668e9f8a4479da0ca4291026e0f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ceaf03ee55cedf059c3e70410da9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcda8436a5e68816b74177e6d51cba7.png)
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适中
(0.65)
【推荐1】如图,已知△ABC为等边三角形,M是线段BC上任意一点,N是CA上任意一点,且BM=CN,直线BN与AM相交于G点.
(1)求证:AM=BN;
(2)求∠BGM的度数.
(1)求证:AM=BN;
(2)求∠BGM的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/3abf82bc-e7b4-41ff-ab6a-d78a56a0208e.png?resizew=178)
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真题
【推荐2】如图,
是边长为4的等边三角形,点D,E,F分别在边
,
,
上运动,满足
.
;
(2)设
的长为x,
的面积为y,求y关于x的函数解析式;
(3)结合(2)所得的函数,描述
的面积随
的增大如何变化.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcb4e1c3913b81c0096f1a14096d677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09645ecedf397df03aa258a5bb14d83.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)结合(2)所得的函数,描述
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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