已知,在平面直角坐标系中,
为坐标原点,点
的坐标为
,点
的坐标为
,其中
,
满足
.
![](https://img.xkw.com/dksih/QBM/2020/9/5/2543491726516224/2546252052340736/STEM/a93d27087a8e4977b49c22f24bb77829.png?resizew=199)
(1)求点
、点
的坐标;
(2)将
点向右平移
个单位
到点
,连接
.
①如图1,若
交
轴于点
,且
,求
的取值范围;
②如图2,若
,
平分
交
于点
,已知点
为
轴负半轴上一动点(不与
点重合),射线
交直线
交于点
,交直线
于点
,试探究
点在运动过程中
、
、
之间是否有某种确定的数量关系?直接写出你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4a90cfdbfa05577b6ec0b22739e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabe33b24e9cabf7a5530bc75d37da2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7b6bcf84883d8c8d65788d4591da23.png)
![](https://img.xkw.com/dksih/QBM/2020/9/5/2543491726516224/2546252052340736/STEM/1fab320299624d86875648ae3270559d.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2020/9/5/2543491726516224/2546252052340736/STEM/a93d27087a8e4977b49c22f24bb77829.png?resizew=199)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cc24b575f4fd1ea7fe8ce5612fa9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b582467d44c270bb10c5131c14bd9ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
更新时间:2020-09-09 21:05:58
|
相似题推荐
解答题-问答题
|
困难
(0.15)
名校
【推荐1】如图:数轴上
三点分别表示的数为
,点
表示的数为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【阅读材料】:在数轴上表示数
的点到原点的距离叫做
的绝对值,记为
,数轴上表示数
的点与表示数
的点的距离记
(或
),数轴上数
表示的点到表示数
的点与表示数
的点的距离之和记为
.
【初步运用】:(1)填空:若
,则
____________;若
,则
____________;
【延伸探究】:(2)若动点
从点
出发,以每秒2个单位长度的速度向右运动,当经过多少秒时,动点
到点
、点
的距离之和为10;
【拓展探究】:(3)若点
表示的数为
,当
取最小值时,动点
从点
出发,以每秒2个单位长度的速度向
点运动,当到达
点后立即以每秒1个单位长度的速度返回
点,动点
从点
出发,以每秒1个单位长度的速度向
点运动,当到达
点后立即以每秒2个单位长度的速度返回
点,
同时开始运动,当经过多少秒时,点
、点
之间的距离正好等于点
到点
、点
的距离之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc459102925d1b15c2764669e25c28da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/453056ad-2fc1-494d-9eb5-024b06a2a6be.png?resizew=269)
【阅读材料】:在数轴上表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1103ddae6ffaba2b15808c6df09c0248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a4034330ec48e65d5a627c4184760.png)
【初步运用】:(1)填空:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47e517a8a2c73a5bb07e1ac820d3dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644cff4a7ca2ae315391a04dfbb60df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
【延伸探究】:(2)若动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
【拓展探究】:(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbc5542ee4d3d6300f06e18c7393fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】如图,数轴上有A、B、C三个点,A、B、C对应的数分别是a、b、c,且满足
,动点P从A出发,以每秒1个单位的速度向终点C运动,设运动时间为t秒.
(1)求a、b、c的值;
(2)若点P到A点的距离是点P到B点的距离的2倍,求点P对应的数;
(3)当点P运动到B点时,点Q从点A出发,以每秒3个单位的速度向C点运动,Q点到达C点后,再立即以同样的速度返回,运动到终点A.在点Q开始运动后第几秒时,P、Q两点之间的距离为4?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889e0f819bd614a844c405c617298bb6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/f4b3b73a-354f-4d57-893f-10e513440e89.png?resizew=157)
(1)求a、b、c的值;
(2)若点P到A点的距离是点P到B点的距离的2倍,求点P对应的数;
(3)当点P运动到B点时,点Q从点A出发,以每秒3个单位的速度向C点运动,Q点到达C点后,再立即以同样的速度返回,运动到终点A.在点Q开始运动后第几秒时,P、Q两点之间的距离为4?请说明理由.
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解题方法
【推荐3】在平面直角坐标系中,C 是第一象限的点,过 C 点作 CA⊥x 轴于点 A(a,0),点 B(0,b) 是 y 轴正半轴上的一点,且 a、b 满足
+ |𝑏− 4| = 0,𝑆四边形𝐴𝑂𝐵𝐶 = 9.
(1)求C点坐标;
(2) D为x轴上一点,若𝑆△𝐵𝐶𝐷 = 5,求D点坐标;
(3) 若点 P 为直线 BC 上一点,平面内有两点 E(m , n+2),F(m+3,n)且 E, F 不在直线 BC 上,若𝑆△𝑃𝐸𝐹 = 12,求 m,n 满足的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4efc33226c8fedd3cdd599355e5245b.png)
(1)求C点坐标;
(2) D为x轴上一点,若𝑆△𝐵𝐶𝐷 = 5,求D点坐标;
(3) 若点 P 为直线 BC 上一点,平面内有两点 E(m , n+2),F(m+3,n)且 E, F 不在直线 BC 上,若𝑆△𝑃𝐸𝐹 = 12,求 m,n 满足的数量关系.
![](https://img.xkw.com/dksih/QBM/2020/6/5/2478183806738432/2478875541184512/STEM/84ac132939424eb8a9815a0ff4c4e4d7.png?resizew=153)
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【推荐1】如图,点A、B的坐标分别为(a,0),(b,0),且满足(2a+2)2
0,现同时将A、B分别向上平移2个单位,再向右平移1个单位,分别得到A、B对应点C、D,连接AC、BD.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975891798867968/2986265880821760/STEM/13346c0f-8f88-41ce-b953-4a560f8aa733.png?resizew=459)
(1)求点A、B的坐标;
(2)如图1,点P(0,m)是y轴负半轴上一动点,连接AP、PD,其中直线PD交x轴于E点,若S△PAE=S△BDE,求m的值;
(3)如图2,连接BC,在直线BC上取一点F,使BF=3CF,求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20700b5a984e261fba032ce83d29c3f5.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975891798867968/2986265880821760/STEM/13346c0f-8f88-41ce-b953-4a560f8aa733.png?resizew=459)
(1)求点A、B的坐标;
(2)如图1,点P(0,m)是y轴负半轴上一动点,连接AP、PD,其中直线PD交x轴于E点,若S△PAE=S△BDE,求m的值;
(3)如图2,连接BC,在直线BC上取一点F,使BF=3CF,求点F的坐标.
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【推荐2】如图,在平面直角坐标系xOy中,点A(a,0),B(c,c),C(0,c),且满足(a﹣c+4)2+
=0,P点从A点出发沿x轴正方向以每秒2个单位长度的速度匀速移动,Q点从O点出发沿y轴负方向以每秒1个单位长度的速度匀速移动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/74bb0e4f-6f2a-4a34-b05b-c3994d00a2c8.png?resizew=374)
(1)求点B的坐标及AO和BC位置关系;
(2)当P、Q分别是线段AO,OC上时,连接PB,QB,使
,求出点P的坐标;
(3)在P、Q的运动过程中,当∠CBQ=30°时,请探究∠OPQ和∠PQB的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b97160cdd5c506c9388d3704af22377.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/74bb0e4f-6f2a-4a34-b05b-c3994d00a2c8.png?resizew=374)
(1)求点B的坐标及AO和BC位置关系;
(2)当P、Q分别是线段AO,OC上时,连接PB,QB,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2d617149d81872b91ae14a5f410e0c.png)
(3)在P、Q的运动过程中,当∠CBQ=30°时,请探究∠OPQ和∠PQB的数量关系,并说明理由.
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解答题-计算题
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解题方法
【推荐1】学习了正多边形之后,小马同学发现利用对称、旋转等方法可以计算等分正多边形面积的方案.
(1)请聪明的你将下面图①、图②、图③的等边三角形分别割成2个、3个、4个全等三角形;
(2)如图④,等边△ABC边长AB=4,点O为它的外心,点M、N分别为边AB、BC上的动点(不与端点重合),且∠MON=120°,若四边形BMON的面积为s,它的周长记为l,求
最小值;
(3)如图⑤,等边△ABC的边长AB=4,点P为边CA延长线上一点,点Q为边AB延长线上一点,点D为BC边中点,且∠PDQ=120°,若PA=x,请用含x的代数式表示△BDQ的面积S△BDQ.
(1)请聪明的你将下面图①、图②、图③的等边三角形分别割成2个、3个、4个全等三角形;
(2)如图④,等边△ABC边长AB=4,点O为它的外心,点M、N分别为边AB、BC上的动点(不与端点重合),且∠MON=120°,若四边形BMON的面积为s,它的周长记为l,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751ccb261e861d98df497747aa70d7a7.png)
(3)如图⑤,等边△ABC的边长AB=4,点P为边CA延长线上一点,点Q为边AB延长线上一点,点D为BC边中点,且∠PDQ=120°,若PA=x,请用含x的代数式表示△BDQ的面积S△BDQ.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421324835315712/2421713524432896/STEM/3643717326ff4285aca3d20b627fff12.png?resizew=590)
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【推荐2】如图1,点M在直线AB上,点P,N在直线CD上,过点N作NE∥PM,连接ME.
(1)若AB∥CD,点E在直线AB,CD之间,求证:∠MEN=∠BME+∠MPN;
(2)如图2,ME的延长线交直线CD于点Q,作NG平分∠ENQ交EQ于点G,作EF平分∠MEN,过点E作HE∥NG.若点F,H分别在MP,PQ上,探究当∠MPQ+2∠FEH=90°时,线段NE与NG的大小关系.
(1)若AB∥CD,点E在直线AB,CD之间,求证:∠MEN=∠BME+∠MPN;
(2)如图2,ME的延长线交直线CD于点Q,作NG平分∠ENQ交EQ于点G,作EF平分∠MEN,过点E作HE∥NG.若点F,H分别在MP,PQ上,探究当∠MPQ+2∠FEH=90°时,线段NE与NG的大小关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c31e9bb2-09af-47bf-a65b-af15d1b881f9.png?resizew=497)
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解题方法
【推荐3】【概念学习】在平面中,我们把大于
且小于
的角称为优角,如果两个角相加等于
,那么称这两个角互为组角,简称互组.
(1)若
、
互为组角,且
,则
________
;
【理解运用】
习惯上,我们把有一个内角大于
的四边形俗称为镖形.
(2)如图①,在镖形
中,优角
与钝角
互为组角,试探索内角
、
、
与钝角
之间的数量关系,并说明理由;
【拓展延伸】
(3)如图②,
________;(用含
的代数式表示)
(4)如图③,已知四边形
中,延长
、
交于点
,延长
、
交于
,
、
的平分线交于点
,
;
①写出图中一对互组的角________(两个平角除外);
②直接运用(2)中的结论,试说明:
;
(5)如图④,
、
分别为
,
的2019等分线(
).它们的交点从上到下依次为
,
,
,…,
.已知
,
,则
_______
.(用含
、
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dce3b5e3f9d0e5300083b8e60543319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
【理解运用】
习惯上,我们把有一个内角大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
(2)如图①,在镖形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
【拓展延伸】
(3)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262367aabe2a48b2aed9842cad6842a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(4)如图③,已知四边形
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c7bbe0ac1c88c9d35978a7184ba553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb605077490cb4358612423809fbb1e.png)
①写出图中一对互组的角________(两个平角除外);
②直接运用(2)中的结论,试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3afe666651f907e0a0a93e6dd6ff559.png)
(5)如图④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cec7172d480a763d004c43178bd4f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d2a3bd3c462f8528755c472ddae86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc1df99f9a3c9e22d2041a89e2880f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11c710a30a8b3ad4bc5150bf41d113c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b1b4d405b837cdc8f0f7f02e56ed8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd99033b3a4630375de2a5d4430ef995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e19bf2f8e840baba452b3c9d9fa9155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3756f3457e07e5fb98bb857ca64d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】已知
,点
、
分别是
、
上的点,点
在
、
之间,连接
、
.
,求
的度数.
(2)在(1)的条件下,分别作
和
的平分线交于点
,求
的度数.
(3)如图2,若点
是
下方一点,
平分
,
平分
,已知
.则判断以下两个结论是否正确,并证明你认为正确的结论.①
为定值;②
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.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/895dc3dc3a6606ff487a4c4863e18509.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/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5c8f064aa1535521051d0ca5096f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccdb7eaeec4a247837ec825c3d63941.png)
(2)在(1)的条件下,分别作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0998bc502aca3ca281fea703da2b9c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90141185faab937aafd2a072944f697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905a43e5b7da602ecfa1dacc7c8d5b87.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09245fd7604997221b9a1a6e8fb752f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6a5e341c6b28320fa81aff95e33979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ef2202bc82ad2feed46812caa9ade0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6354c3c1f66feacacbdd2f10a0fd0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afebec6106dc99171da38642450a343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a91ea5556fc0d7e35cfcc5edb4f56e6.png)
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【推荐2】问题背景:在小学我们了解到三角形内角和等于
(内角和定理),学完平行线相关知识后我们可以对内角和定理进行证明.
的顶点
作直线
,求证:
(即三角形内角和为
).
尝试应用:请利用内角和定理的结论解答下列问题(仅限于本题)
(2)已知
内部两条射线
、
交于点
,
①如图2:若
,则
______度(直接写出答案即可)
②如图3:若
,
、
分别平分
、
,求
的度数
拓展创新:
(3)如图4:在四边形
中,
、
的角平分线交于点E,求
,
和
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8fb4b5afd9999b210f1bab1a0854d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c92dcd937763cff6e055a3e14391ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
尝试应用:请利用内角和定理的结论解答下列问题(仅限于本题)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①如图2:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c351d6e0b7f3da22d2c34a4ee0f6f16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c2da9329da970e3960aba2ae5fff4.png)
②如图3:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e40b1de16931e8a3aa1c78589f70f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
拓展创新:
(3)如图4:在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
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