已知直线
,
,
分别是直线
,
上的一点,
为平面上一点,
为
延长线上的一点,
交
于点F,
和
的角平分线
,
相交于点
.
(1)如图1,
①若
,
,求
的度数.
②试说明:
.
(2)如图2,当点N位于点F的左侧时,若
试求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef1f7b9adab87736321e30949a4d668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d76d1f1c2cccdc00e111e4f37b74459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d0d739401e5175ea64194632084088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/534543d8-22f9-43a9-a3a8-74a9f04c772b.png?resizew=334)
(1)如图1,
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6bd5f3e35355139cb7d55991face464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92a477ee5c1988789c5a5263b7aa3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9c1e0c3cab6b7bb3229221f4310ab0.png)
②试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7d35dce9652d01cb9aaa3289496893.png)
(2)如图2,当点N位于点F的左侧时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d53cd72000925484408ad25066dcd6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9c1e0c3cab6b7bb3229221f4310ab0.png)
22-23七年级下·四川雅安·期末 查看更多[2]
更新时间:2023-08-07 09:01:03
|
相似题推荐
解答题-证明题
|
较难
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名校
【推荐1】已知线段
线段
,直线
分别交
、
于点M、N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/888cae71-abc4-4444-a0d6-fb4417977c33.png?resizew=453)
(1)如图1,E在线段
上,设
,
,且x、y满足
,则
的度数为 ;
(2)如图2,点
在线段
上,
,
平分
交
的延长线于点
,试判断
、
与
之间的数量关系,并说明理由;
(3)如图3,当点
在直线
上运动时,若
与
的角平分线交于点
,试判断
与
的数量关系,请画好图形并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8099c774a6ae6dd98712b0b90b60cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/888cae71-abc4-4444-a0d6-fb4417977c33.png?resizew=453)
(1)如图1,E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f3db4a1498d0d6c4d564bcbc3fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a1e86e46834785b436376fd39b4759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ca1110c2daa83adb33863e09a6bd43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7494680d3217037fca1bd91e8bd1b72.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4fe8d63ecded6e0672cea489ab54cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1454c510de4cad93a78b505e0ef8c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6c8c9bec9cb426ab66f5cdb0c6591d.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9cc98e6df306063e645044f0faa7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8490cab76a1a6e5cb35de8535be9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e341e4f389f772d10b1d588d6c7bd86.png)
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【推荐2】如图1,在
中,∠ABC的平分线交AD于点E,∠ADC的平分线交BC于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/46299e99-dc62-413f-b351-6e3d6cf61a6e.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/1bfe016c-44a2-4103-9f15-4f60db99a286.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/f0f50f0b-5ba1-4c9d-b7de-dfc49eee041f.png?resizew=151)
(1)求证:四边形BEDF为平行四边形;
(2)如图2,连接EF,若EF⊥BC,BF=8,EF=4,求
的面积;
(3)如图3,连接EF,作
关于直线EF对称的
,其中点A,B的对应点分别为点C,H,恰好有HE⊥DF,垂足为G.若
,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/46299e99-dc62-413f-b351-6e3d6cf61a6e.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/1bfe016c-44a2-4103-9f15-4f60db99a286.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/f0f50f0b-5ba1-4c9d-b7de-dfc49eee041f.png?resizew=151)
(1)求证:四边形BEDF为平行四边形;
(2)如图2,连接EF,若EF⊥BC,BF=8,EF=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(3)如图3,连接EF,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14b86b8bf99386fc939c9c12b1355ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d484f018fb102030d0452b978bd810a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6469878a955cc09fac22ba5aea3fb962.png)
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【推荐3】【问题初探】
在一个角的内部,从顶点画一条射线,得到三个角,若其中有一个角是另一个角的
倍,则称这条射线是已知角的“奇妙线”.
例如:图
中
,则射线
是
的“奇妙线”.
(1)一个角的角平分线______这个角的“奇妙线”;(填“是”或“不是”)
【类比分析】
(2)如图
,若
,在
内部画一条射线
,使
是
的“奇妙线”,求
的度数;
【变式拓展】
(3)如图
,若
,且射线
绕点
从
位置开始以每秒
的速度逆时针旋转,同时射线
以每秒
的速度也绕点
逆时针旋转,当射线
与射线
重合时全部停止运动.设旋转时间为
秒,请直接写出
为何值时,射线
是
的“奇妙线”.
在一个角的内部,从顶点画一条射线,得到三个角,若其中有一个角是另一个角的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
例如:图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913e8dd0baf4537ddcab3c2af80518b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(1)一个角的角平分线______这个角的“奇妙线”;(填“是”或“不是”)
【类比分析】
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5e54ea5aaeeb786e870b4a74b1d7d7.png)
【变式拓展】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/9464ad0a-10cf-4a03-be8c-b71e5a7045d8.png?resizew=304)
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【推荐1】如图,已知射线
,
,
,
在
上,且满足
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/622f70f4-d36c-4f27-b18c-e32279f65d8c.png?resizew=215)
(1)求
的度数.
(2)若向右平行移动
,其他条件不变,那么
的值是否发生变化?若变化,请找出变化规律;若不变,请求出这个比值.
(3)在向右平行移动
的过程中,是否存在某种情况,使
?若存在,请直接写出
的度数;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3a3b8f8e6dae466161428d68e76c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1f524c10df6b6ff8adaf7a04fbc8a2.png)
![](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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0b9529537e4e6f660f2fa4348a09b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/622f70f4-d36c-4f27-b18c-e32279f65d8c.png?resizew=215)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2460507a462453e084eaf70a7d867e9.png)
(2)若向右平行移动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cd508a14ebe03d869bcbe80c21dc84.png)
(3)在向右平行移动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5fa382fb110b32db9f0bd4996a7d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f9341d51c827a29a4a0b0b3dded16c.png)
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【推荐2】如图1,四边形ABCD中,AD∥BC,DE平分∠ADB,∠BDC=∠BCD,
![](https://img.xkw.com/dksih/QBM/2020/10/26/2579456646316032/2579554125004800/STEM/e4a13f88b82d4f87848d7159101ddeae.png?resizew=381)
(1)求证:∠DEC+∠DCE=90°;
(2)如图2,若∠ABD的平分线与CD的延长线交于F,且∠F=58°,求∠ABC.
![](https://img.xkw.com/dksih/QBM/2020/10/26/2579456646316032/2579554125004800/STEM/e4a13f88b82d4f87848d7159101ddeae.png?resizew=381)
(1)求证:∠DEC+∠DCE=90°;
(2)如图2,若∠ABD的平分线与CD的延长线交于F,且∠F=58°,求∠ABC.
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解题方法
【推荐3】如图1,已知PQ//MN,且∠BAM=2∠BAN.
(1)求∠BAN的度数;
(2)如图1所示,射线AM绕点A开始顺时针旋转至AN便立即回转至AM位置,射线BP绕点B开始顺时针旋转至BQ便立即回转至BP位置.若AM转动的速度是每秒2度,BP转动的速度是每秒1度,若射线BP先转动30秒,射线AM才开始转动,在射线BP到达BQ之前,射线AM转动多少秒?两射线互相平行.
(3)如图2,若两射线分别绕点A,B顺时针方向同时转动,速度同(2),在射线AM到达AN之前,若两射线交于点C,过C作∠ACD交PQ于点D,且∠ACD=120°,在转动过程中,请探究∠BAC与∠BCD的数量关系是否发生变化?若不变,请求出其数量关系:若改变,请说明理由.
(1)求∠BAN的度数;
(2)如图1所示,射线AM绕点A开始顺时针旋转至AN便立即回转至AM位置,射线BP绕点B开始顺时针旋转至BQ便立即回转至BP位置.若AM转动的速度是每秒2度,BP转动的速度是每秒1度,若射线BP先转动30秒,射线AM才开始转动,在射线BP到达BQ之前,射线AM转动多少秒?两射线互相平行.
(3)如图2,若两射线分别绕点A,B顺时针方向同时转动,速度同(2),在射线AM到达AN之前,若两射线交于点C,过C作∠ACD交PQ于点D,且∠ACD=120°,在转动过程中,请探究∠BAC与∠BCD的数量关系是否发生变化?若不变,请求出其数量关系:若改变,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515607969619968/2515879144521728/STEM/b59181fc-0824-41f2-a728-44ae66a64e0d.png)
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【推荐1】如图,点
、
分别是正八边形
(每条边相等,每个角相等)的边
、
上的点,且
,
交
于点P.
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d4a6cf11cda87b3dfafaecdec683f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa21b1fe1efb7137779f1effc76545c6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d65a776109a24981277b0f3e05b96.png)
![](https://img.xkw.com/dksih/QBM/2020/10/27/2579825370726400/2580236180258816/STEM/b78d3507-5348-466b-aa41-8588c2ed39d2.png)
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【推荐2】如果1条线段将一个三角形分成2个等腰三角形,那么这1条线段称为这个三角形的“分割线”;如果2条线段将一个三角形分成3个等腰三角形,那么这2条线段称为这个三角形的“黄金分割线”.
(1)填空:等边三角形_________(填“存在"或“不存在”)“分割线”;顶角为钝角的等腰三角形________(填“存在”或“不存在”)“黄金分割线”.
(2)在
中,
,
为钝角,若这个三角形存在“分割线”,直接写出
的所有可能______.
(1)填空:等边三角形_________(填“存在"或“不存在”)“分割线”;顶角为钝角的等腰三角形________(填“存在”或“不存在”)“黄金分割线”.
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐3】如图1,直线GH分别交AB,CD于点E,F(点F在点E的右侧),若∠1+∠2=180°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/92977895-8801-471c-9b6b-7ec0f1630bde.png?resizew=551)
(1)求证:AB
CD;
(2)如图2所示,点M、N在AB,CD之间,且位于E,F的异侧,连MN,若2∠M=3∠N,则∠AEM,∠NFD,∠N三个角之间存在何种数量关系,并说明理由.
(3)如图3所示,点M在线段EF上,点N在直线CD的下方,点P是直线AB上一点(在E的左侧),连接MP,PN,NF,若∠MPN=2∠MPB,∠NFH=2∠HFD,则请直接写出∠PMH与∠N之间的数量.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/92977895-8801-471c-9b6b-7ec0f1630bde.png?resizew=551)
(1)求证:AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如图2所示,点M、N在AB,CD之间,且位于E,F的异侧,连MN,若2∠M=3∠N,则∠AEM,∠NFD,∠N三个角之间存在何种数量关系,并说明理由.
(3)如图3所示,点M在线段EF上,点N在直线CD的下方,点P是直线AB上一点(在E的左侧),连接MP,PN,NF,若∠MPN=2∠MPB,∠NFH=2∠HFD,则请直接写出∠PMH与∠N之间的数量.
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【推荐1】如图1,在平面直角坐标系中,点A(0,a),B(b,0),C(c,0),且满足
+(a+b﹣7)2+|c+a+2|=0.
(1)求A、B、C三点的坐标及
ABC的面积;
(2)若y轴上有一点H,使得
ABH的面积等于
ABC的面积,求点H的坐标;
(3)如图2,直线MN经过A、B两点,点D是线段CO上一动点(不与端点重合),过点D作EF∥MN交y轴负半轴于点E,∠MAO与∠FDO的角平分线相交于点G,问:∠AGD的度数是否为定值?若是,求出∠AGD的度数,若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a68e696225e1a6f4d3475c2b19efde.png)
(1)求A、B、C三点的坐标及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)若y轴上有一点H,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)如图2,直线MN经过A、B两点,点D是线段CO上一动点(不与端点重合),过点D作EF∥MN交y轴负半轴于点E,∠MAO与∠FDO的角平分线相交于点G,问:∠AGD的度数是否为定值?若是,求出∠AGD的度数,若不是,说明理由.
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772372984791040/2778083051405312/STEM/957e4fb0-96e3-4ca3-9b21-dbb3416c5f03.png)
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【推荐2】问题探究:
(1)如图1,在△ABC中,BE平分∠ABC,CE平分∠ACB.若
,则∠BEC= ;若
,则∠BEC= .
(2)如图2,在△ABC中,BD、BE三等分∠ABC,CD、CE三等分∠ACB.若
,则∠BEC=_________;
(3)如图3,在△ABC中,BE平分∠ABC,CE平分外角∠ACM.若
,则∠BEC=_________;
(4)如图4,在△ABC中,BE平分外角∠CBM,CE平分外角∠BCN.若
,则∠BEC=_________.
(1)如图1,在△ABC中,BE平分∠ABC,CE平分∠ACB.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
(2)如图2,在△ABC中,BD、BE三等分∠ABC,CD、CE三等分∠ACB.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
(3)如图3,在△ABC中,BE平分∠ABC,CE平分外角∠ACM.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
(4)如图4,在△ABC中,BE平分外角∠CBM,CE平分外角∠BCN.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://img.xkw.com/dksih/QBM/2014/6/4/1573731207045120/1573731213090816/STEM/915fbb96-2e40-4dcb-98ae-3463dae6a6e1.png?resizew=641)
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