如图,已知
和
都是等边角形,P、Q分别为
、
的中点.
(1)如图1,当点D、E分别在边
、
上时,求证:
是等边三角形;
(2)如图2,当点E在
的内部,点D在
的右侧时,请你判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764986255384576/2816985396314112/STEM/3b8ae212-e69a-4d3f-8cf3-57978f86f972.png)
(1)如图1,当点D、E分别在边
![](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/e87b2f781cafa7989d81f9bf8c42b150.png)
(2)如图2,当点E在
![](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/e87b2f781cafa7989d81f9bf8c42b150.png)
更新时间:2021-09-27 09:14:22
|
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解答题-证明题
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适中
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【推荐1】已知:如图,AF=CE,DE⊥AC,BF⊥AC,E、F是垂足,DE=BF,求证:AB∥CD.
![](https://img.xkw.com/dksih/QBM/2019/5/10/2200702088167424/2203728800096256/STEM/8308b372-32f6-4b41-a7cb-3316285118bb.png?resizew=180)
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解答题-证明题
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适中
(0.65)
【推荐2】已知
中,
,
中,
,
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时,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/8d54f656-2fb0-4a4a-b7f6-fdf2fea824b0.png?resizew=125)
(1)请直接写出
和
的形状;
(2)求证:
;
(3)请求出
的度数.
![](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/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ead706ccc238d868654030a3626847c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b80da60742d573eb1f96707bad80aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cecf746d5eb0739284b23b93c110a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/8d54f656-2fb0-4a4a-b7f6-fdf2fea824b0.png?resizew=125)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
(3)请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
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【推荐1】已知CD为△ABC的中线,∠A及∠BDC的度数分别是方程x2-75x+1350=0的两根,
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/5a41b11e-ceaa-415d-98ca-a8dce6191832.png?resizew=196)
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解答题-问答题
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名校
【推荐2】如图,以点O为坐标原点的平面直角坐标系中,四边形
是矩形,
,
,动点F从点O出发,沿OB以每秒2个单位长度的速度向终点B运动.过点F作
于点M(点F不与点O、B重合),作
,边FQ交射线OC于点Q.设点F的运动时间为t秒(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/83b933e1-f483-414d-abb8-9e5cb9c2b179.png?resizew=359)
(1)如图1.
①求
的长;
②连接
,当
平分
时,求点F的坐标;
(2)设
与
重叠部分图形的面积为S,当
时,直接写出点Q的纵坐标;
(3)当线段
的垂直平分线经过
一边中点时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d676f0b86cf0eb06854ac6989dad869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc73de1e2de28028f385e8de1eb39e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/83b933e1-f483-414d-abb8-9e5cb9c2b179.png?resizew=359)
(1)如图1.
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②连接
![](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/3daae8ec60b2b1f7577dee687247cebb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ab99c4f8c0a1c039b2d88ef202bb58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9384e9035d86d3cf2e5c8b6966f29de0.png)
(3)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79628b9c258a062a863a71a2677fb348.png)
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