如图,在等腰
中,
,点D是
边上一点,连接
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/a2fce9e0-a36f-413d-8d36-7c8da66a4614.png?resizew=295)
(1)如图1,
,若
,求
的度数.
(2)如图2,若点E在
边上且
,连接
.点M为线段
的中点,过M点作
交
于点N,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71053b2dba1f1d12805269920eb68d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e568aab11f56643bca77a7cf396633.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/a2fce9e0-a36f-413d-8d36-7c8da66a4614.png?resizew=295)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55963a9b9b02737110f57a377b41cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b448911ee8809dee0d506363dffe0a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a518d7ba64c36af89f9444b586fd31ed.png)
(2)如图2,若点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f41d05b6019f05dc520c56f9942145a.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/8d0dec199a7c28f1982f6fd811f60828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139afa90b8ef192290f026d08a1d3601.png)
更新时间:2023-10-25 10:57:55
|
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【推荐1】如图,点D、E是等边
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【推荐2】如图,AD,AE分别是△ABC的高和角平分线.
(1)已知∠B=40°,∠C=60°,求∠DAE的度数;
(2)设∠B=α,∠C=β(α<β).请直接写出用α、β表示∠DAE的关系式 .
(1)已知∠B=40°,∠C=60°,求∠DAE的度数;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/8af3f6de-1eb6-4f05-8478-6d4f63a79b5a.png?resizew=151)
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【推荐1】在4×4的网格中建立如图所示的平面直角坐标系,每个小正方形的顶点叫做格点,点A(1,0)和点B(4,1)均在格点上.请仅用无刻度的直尺和网格特点完成画图,画图过程用虚线,画图的结果用实线表示,请按步骤解答下列各题,不要求说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/341d6847-2e59-42e8-a98d-6a74d3a2d5b6.png?resizew=195)
(1)直接写出AB的长为 ;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/341d6847-2e59-42e8-a98d-6a74d3a2d5b6.png?resizew=195)
(1)直接写出AB的长为 ;
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【推荐2】已知:如图
,
,
,
(1)在图①中,求证:
,
;
(2)在图②中,点
是
中点,点
是
中点,试探究
与
的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d3c378b1118d331d30b63fc587b270.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/b63a0cd3-4b3d-418d-92cc-15b0106815b6.png?resizew=317)
(1)在图①中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)在图②中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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【推荐1】如图,将长方形
沿直线
对折,将点B折到点E处,
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/7020b7e7-4b7d-46df-9faf-3f7e72df3696.png?resizew=155)
(1)求证:
是等腰三角形;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e58291be7fa4f27155e3a4c56124e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】如图,在四边形
中,
,E为
中点,连接
并延长
交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/1e32efb3-15c9-4b5b-be16-f07f63fe3ae5.png?resizew=192)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee8395bbad7eb776f328d816b5abbb7.png)
(2)若
平分
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/1e32efb3-15c9-4b5b-be16-f07f63fe3ae5.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee8395bbad7eb776f328d816b5abbb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐1】如图,
和
都是
的高,相交于F点,连接
.
(1)求证:
;
(2)若点D是
的中点,
,则
的长为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/ddde7e19-8336-4a60-bf3d-0c31423ccf4e.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec676b2182cd2d1a82073c91663bfb3.png)
(2)若点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc456a64af3b0335e7a896c4014fc55.png)
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【推荐2】如图,点F是△ABC的边BC延长线上的一点,且AC=CF,
和
的平分线交于点P.
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596517997953024/2598653117472768/STEM/a174c24f-9ed5-42c2-ace9-849998f50bb2.png)
求证:(1)点P在
的平分线上;
(2)CP垂直平分AF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ba015fc9f3700a8c9ccc423cf1c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3bf1051bf5bd96632416513b9183ac6.png)
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596517997953024/2598653117472768/STEM/a174c24f-9ed5-42c2-ace9-849998f50bb2.png)
求证:(1)点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd58a0d1e4ef538b3202a567ccf08e1.png)
(2)CP垂直平分AF.
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