[问题背景](1)如图1,
中,
,
于D,求证:
;
[变式迁移](2)如图2,
中,
,
,D为AC中点,连BD,E为AB上一点,连CE交BD于F.若
,求AE:BE的值;
[拓展创新](3)如图3,
,
,
,
,直接写出
的值(用含n的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/409a586ee3e73eba1abd3f65a82c4aa9.png)
[变式迁移](2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e101e5fd4dc52e57785616d4fa3c28f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a91e83ab6b4e8d10d6ad1acc7591a16.png)
[拓展创新](3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664d5098eacaa648fa7c0c74aeca9242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7726e49ee962b93ff88c93be0bc070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0632fd9adb497dde8b3e8a4a6eb849a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/f8f71f3a-e2a6-412a-85a7-824c4e2996d4.png?resizew=604)
更新时间:2022-06-26 17:12:54
|
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解答题-问答题
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困难
(0.15)
【推荐1】如图,在直角三角形ABC中,直角边
,
,设P、Q分别为AB,BC上的动点,点P自点A沿AB方向向点B作匀速移动且速度为每秒2cm,同时点Q自点B沿BC方向向点C作匀速移动且速度为每秒1cm,当P点到达B点时,Q点就停止移动.设P,Q移动的时间t秒.
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(1)写出
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(2)当t为何值时,
为等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
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(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e31351d7b971bda5c97c662fc71103a.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
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解答题-证明题
|
困难
(0.15)
【推荐2】
的弦AB与CD交于点E,点F,G分别为AB,CD的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8a338612-2082-4092-998e-a56ca393c373.png?resizew=540)
(1)如图1,求证:
;
(2)如图2,连接AG,
,求证:
;
(3)如图3,在(2)的条件下,连接OF并延长交
于点H,连接EH,
,求CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8a338612-2082-4092-998e-a56ca393c373.png?resizew=540)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb440a7cefecac2f2eb3bb383b41d58.png)
(2)如图2,连接AG,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef87cc238680cb14032af1ff0c14fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10e5244c22417a0071cfc557feb8568.png)
(3)如图3,在(2)的条件下,连接OF并延长交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329e27c5a3c59227a102cb5fd225cf9f.png)
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解答题-证明题
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困难
(0.15)
名校
【推荐1】如图,正方形ABCD中,点E为边BC上的一点(不与点B,点C重合),点F在边AD上,且满足FB=FE,FE与对角线AC交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/53238184-0dc0-49d2-ad1a-fcbf733939b2.png?resizew=205)
(1)探索线段AF,BE长度之间的数量关系,并说明理由.
(2)若AG=CG,
①求证AF=CE;
②求tan∠EGC的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/53238184-0dc0-49d2-ad1a-fcbf733939b2.png?resizew=205)
(1)探索线段AF,BE长度之间的数量关系,并说明理由.
(2)若AG=CG,
①求证AF=CE;
②求tan∠EGC的值.
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解答题-证明题
|
困难
(0.15)
【推荐2】已知:
为
的直径,以
为边作矩形
,点E和点G是
上两点,连接
、
和
,
.
(1)如图1,求证:
;
(2)如图2,过点E作
,垂足为点F,连接
,求证:
;
(3)如图3,在(2)的条件下,连接
和
,若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6add98ef5f7d75ac89f846ab38f58f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/a219ad4f-6c51-447d-a509-0b1c11caf553.png?resizew=517)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb5180dd422b49f1bd84f0a1c4bf4b4.png)
(2)如图2,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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(3)如图3,在(2)的条件下,连接
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