如图,在
中,∠BAD,∠BCD的平分线分别交对角线BD于点E,F,求证:AE=CF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961751391297536/2964382633377792/STEM/932774ea-d9f8-403e-8278-9d05496ed6af.png?resizew=303)
17-18八年级下·福建泉州·期中 查看更多[7]
更新时间:2022-04-23 15:14:49
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解答题-问答题
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【推荐1】如图,已知
,
.点P是射线AM上一动点(与点A不重合)、BC,BD分别平分
和
,分别交射线AM于点C,D.
的度数.
(2)当点P运动到使
时,
的度数是多少?为什么?
(3)当点P运动时,
与
之间的数量关系是否随之发生变化?若不变化.请写出它们之间的关系,并说明理由;若变化,请写出变化规律.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7dc7451e667ad77a26e75ce11e709e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9cc98e6df306063e645044f0faa7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fed9a763c7c81004fde8f4f9693d2f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
(2)当点P运动到使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56da880ea1c9760023f70fd0ede58a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(3)当点P运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
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【推荐2】如图,
于点E,
于点B,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/17dcad67-7136-4992-b4d9-246bf1aa117b.png?resizew=140)
(1)求证:
;
(2)若
平分
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d5ff57f147aa0628fdd47899b5a132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/17dcad67-7136-4992-b4d9-246bf1aa117b.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735bd70c2fa2bf51fd7aa448b20d0be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
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【推荐3】如图所示,
,直线EF分别交AB,CD于点G,H,HN是∠DHG的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/8ccd554a-e2d8-4020-851c-59a3192c395a.png?resizew=316)
(1)如果GM是∠BGE的平分线,(如图①)试判断并证明GM和HN的位置关系;
证明:∵
,
∴∠BGE=______(两直线平行,同位角相等.)
∵GM是∠BGE的平分线,
∴______=______![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366f7a08352ff3c12d9ac74762c62a64.png)
∵HN是∠DHG的平分线
∴______=______![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3ef90c8a1f6204d7678ad2adcd283b.png)
∴∠MGE=∠NHG(等量代换)
∴GM和HN的位置关系是______,(___________________).
(2)如果GM是∠AGH的平分线,(如图②)(1)中的结论还成立吗?(不必证明)
(3)如果GM是∠BGH的平分线,(如图③)(1)中的结论还成立吗?如果不成立,GM与HN又有怎样的位置关系?请直接写出你的猜想不必证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/8ccd554a-e2d8-4020-851c-59a3192c395a.png?resizew=316)
(1)如果GM是∠BGE的平分线,(如图①)试判断并证明GM和HN的位置关系;
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴∠BGE=______(两直线平行,同位角相等.)
∵GM是∠BGE的平分线,
∴______=______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366f7a08352ff3c12d9ac74762c62a64.png)
∵HN是∠DHG的平分线
∴______=______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3ef90c8a1f6204d7678ad2adcd283b.png)
∴∠MGE=∠NHG(等量代换)
∴GM和HN的位置关系是______,(___________________).
(2)如果GM是∠AGH的平分线,(如图②)(1)中的结论还成立吗?(不必证明)
(3)如果GM是∠BGH的平分线,(如图③)(1)中的结论还成立吗?如果不成立,GM与HN又有怎样的位置关系?请直接写出你的猜想不必证明.
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【推荐1】【方法回顾】
如图1,过正方形
的顶点A作一条直l交边
于点P,
于点E,
于点F,猜想
,
,
三条线段的数量关系: ,并证明你的猜想.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/bae5050f-2786-4a74-80f0-514cb0a0a4d5.png?resizew=390)
【问题解决】
如图2,菱形
的边长为
,过点A作一条直线l交边
于点P,且
,点F是
上一点,且
,过点B作
,与直线l交于点E,若
,求
的长.
【思维拓展】
如图3,在正方形
中,点P在
所在直线上的上方,
,连接
,
,若
的面积与
的面积之差为
,则
的值为 (用含m的式子表示)
如图1,过正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f75139b83eee3bb961eea53d167098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e4cfac43251d5b66003b24890ee074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/bae5050f-2786-4a74-80f0-514cb0a0a4d5.png?resizew=390)
【问题解决】
如图2,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69573b0c465f81c2d6565037356db2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312bfd9a59547d17469d5c5a7897d18a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【思维拓展】
如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b25b6fbf3e3bf766554fc00d376cd.png)
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【推荐2】如图,点B、F、C、E在同一条直线上,∠B=∠E,∠A=∠D,BF=CE.求证:△ABC≌△DEF.
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691626374053888/2697567738822656/STEM/6d28f9ceed8a4747896cc31be9911643.png?resizew=209)
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【推荐1】如图,在
中,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/95b9c13d-1df5-47f7-9d44-d40e8f1350da.png?resizew=216)
(1)若点
、
是
、
的中点,连接
、
,求证:
.
(2)若
平分
且交边
于点
,如果
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/95b9c13d-1df5-47f7-9d44-d40e8f1350da.png?resizew=216)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】在△ABC中,AB=AC,∠ABC=α,D是BC边上一点,以AD为边作△ADE,使AE=AD,∠DAE+∠BAC=180°,
![](https://img.xkw.com/dksih/QBM/2021/5/10/2717814712557568/2791696496271360/STEM/725df6e8-ce94-4ad9-a197-0fae27f0e5ba.png)
(1)直接写出∠ADE的度数(用含α的式子表示);
(2)以AB,AE为边作平行四边形ABFE.
①如图2,若点F恰好落在DE上,求证:BD=CD;
②如图3,若点F恰好落在BC上,求证:BD=CF.
![](https://img.xkw.com/dksih/QBM/2021/5/10/2717814712557568/2791696496271360/STEM/725df6e8-ce94-4ad9-a197-0fae27f0e5ba.png)
(1)直接写出∠ADE的度数(用含α的式子表示);
(2)以AB,AE为边作平行四边形ABFE.
①如图2,若点F恰好落在DE上,求证:BD=CD;
②如图3,若点F恰好落在BC上,求证:BD=CF.
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