如图,已知
是等边三角形,D是
延长线上一点,
平分
,且
.
求证:
(1)
;
(2)
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/35161f13-012b-40cc-b0bc-d5e95df476e3.png?resizew=153)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
更新时间:2022-11-23 08:31:27
|
相似题推荐
解答题-证明题
|
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(0.85)
【推荐1】如图,将
绕顶点A逆时针旋转
至
.连接
.
,
,求
的度数.
(2)若
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a70f42dccbe717bd85872938e26412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6253daa345791eb87d01a0deef8fa4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
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【推荐2】如图,在
和
中,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105653023784960/3113849736192000/STEM/fab5ffc5f7b94fe4a34fb50018367092.png?resizew=223)
求证:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105653023784960/3113849736192000/STEM/fab5ffc5f7b94fe4a34fb50018367092.png?resizew=223)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccdd478d7c98f9321508799640fc5f6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c25d50f9a355707d73941b7be66097b.png)
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【推荐1】如图,
为等腰三角形,
,
和
分别为等边三角形,
与
相交于点F,连接
并延长,交
于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/6501972a-acae-4fa3-b60f-47618e33a3eb.png?resizew=197)
求证:
(1)
;
(2)点G为AB的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/6501972a-acae-4fa3-b60f-47618e33a3eb.png?resizew=197)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061b0a17b2590efbeb08c9778a5e1fa4.png)
(2)点G为AB的中点.
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解答题-问答题
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【推荐2】如图,△ABC是边长为6的等边三角形,点D、E分别是边AB、AC的中点,将△ADE绕点A旋转,BD与CE所在的直线交于点F.
(1)如图(2)所示,将△ADE绕点A逆时针旋转,且旋转角不大于60°,∠CFB的度数是多少?说明你的理由?
(2)当△ADE绕点A旋转时,若△BCF为直角三角形,求出线段BF的长.
(1)如图(2)所示,将△ADE绕点A逆时针旋转,且旋转角不大于60°,∠CFB的度数是多少?说明你的理由?
(2)当△ADE绕点A旋转时,若△BCF为直角三角形,求出线段BF的长.
![](https://img.xkw.com/dksih/QBM/2019/4/30/2193446944251904/2194392999084032/STEM/71ce96708c804d65b52afdaff4addf98.png?resizew=435)
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【推荐1】如图①,在一张长方形纸片
上画一条线段
,将纸片沿线段
折叠(如图②),当
时,试问重叠部分的
是什么三角形,请说明理由(注:长方形纸片对边平行,即:
)\
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e4f9a9fd59ac8fde1cd5e456003e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d474b8cf554bed0cafd7db7f7c0a9e42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/0a484b26-1df9-4074-b64d-9c72daa1ad0a.png?resizew=350)
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【推荐2】已知:设三角形
的三边a,b,c为方程
有两个相等的实数根,且a,b,c满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8421ef6eed8802248eae582aa8ff3da7.png)
(1)求证:
是等边三角形.
(2)若a,b为方程
的两根,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060047e8c63c70b0284490eb9d16cd1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8421ef6eed8802248eae582aa8ff3da7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若a,b为方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62a51f3e20fa2b5af4e53a26b0f6bdd.png)
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