如图,
中,
,
,
为
延长线上一点,点
在
上,且
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e81c8bbdaff4a4d69fad8d7c1f7fa97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
![](https://img.xkw.com/dksih/QBM/2020/3/14/2419363641393152/2419382882082816/STEM/b9fa89cb1b6d4461b778897c072b3594.png?resizew=147)
更新时间:2020-03-14 15:09:59
|
相似题推荐
解答题-证明题
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【推荐1】如图,已知AB是⊙O的直径,M,N分别是AO,BO的中点,CM⊥AB,DN⊥AB.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9b3d3ed364b5ffadc90ea918e0987a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/5f73b69a-037e-46b2-8399-f80592647d11.png?resizew=150)
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【推荐2】已知:如图,
,
于点
,点
在
的角平分线上,且点
到点
、点
的距离相等.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be05c6fab8b7a84bd308ec51566e9ea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ff0a5901c896b54e958d34e0d63f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e82995c1c26b468e2616ba0e66107eb.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ebefca282836247bdbb0d5018879c.png)
![](https://img.xkw.com/dksih/QBM/2020/1/3/2368971558830080/2369684128784384/STEM/d964f61613444df7904c4aaac3f3d9c5.png?resizew=290)
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名校
【推荐1】综合与实践,数学活动课上,老师展示了一个问题:如图1,
和
均为等边三角形,点A,
,
在同一直线上,连接
,请猜想线段
,
,
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/742482ca-bcf4-4a97-99c0-52c66036ef83.png?resizew=313)
(1)【解决问题】请解答老师提出的问题,并完成证明;
(2)【拓展提升】创新小组在老师的启发下,对题目进行改编,将问题中的条件“等边三角形”改为“等腰直角三角形”;如图2,
和
均为等腰直角三角形,
,点A,
,
在同一直线上,
为
中
边上的高,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①求出
的度数;
②猜想线段
,
,
之间的数量关系,并完成证明.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/742482ca-bcf4-4a97-99c0-52c66036ef83.png?resizew=313)
(1)【解决问题】请解答老师提出的问题,并完成证明;
(2)【拓展提升】创新小组在老师的启发下,对题目进行改编,将问题中的条件“等边三角形”改为“等腰直角三角形”;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/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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)
①求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
②猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】[探究型问题](1)如图①,在
中,
,
的垂直平分线交
于点N,交
的延长线于点M,
,求
的度数;
(2)如图②,如果将(1)中的
的度数改为
,其余条件不变,再求
的度数;
(3)你发现了什么规律?试证明你发现的规律;
(4)如图③,如果将(1)中的
改为钝角,其余条件不变,那么对这个问题的规律性认识是否需要修改?请你完整地叙述上述规律.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.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/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ed7679083e92787c25de7c78cfc67.png)
(2)如图②,如果将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aa0b9869db50a9ab48cc32925d8e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ed7679083e92787c25de7c78cfc67.png)
(3)你发现了什么规律?试证明你发现的规律;
(4)如图③,如果将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/8a3736b6-0e35-4d76-a980-35e15ea9a3c6.png?resizew=563)
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