如图,已知
,
,
为
上任意一点,过
点作一条直线分别交
,
的延长线于点
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b333110550208ffce4ec642f78075f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/5384ffe4-4cdc-48c9-b802-2cb5b46f23ed.png?resizew=122)
23-24八年级上·全国·课后作业 查看更多[4]
课时练习 12.2 三角形全等的判定(一)(已下线)第05讲 全等三角形的性质及SSS证全等-【暑假自学课】2023年新八年级数学暑假精品课(人教版)(已下线)专题12.4 全等三角形的判定(SSS、SAS)(知识梳理与考点分类讲解)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题1.4 探索三角形全等的条件(SSS,SAS)(知识梳理与考点分类讲解)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)
更新时间:2023-05-10 09:07:36
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,∠ABC=∠ADC,BF,DE分别平分∠ABC,∠ADC,且∠1=∠3,AB与DC平行吗?为什么?
![](https://img.xkw.com/dksih/QBM/2019/2/3/2132797377822720/2134751854387201/STEM/dc1a8d41ea904ea89c2afef64e72aec9.png?resizew=224)
解:AB∥DC.理由如下:
∵BF,DE分别平行
ABC,
ADC(____)
∴
1=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
ABC,
2=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
____(____)
∵
ABC=
ADC (____)
∴
1=
____(等量代换)
∵
1=
3(____)
∴
2=
____(____)
∴_____∥_____(____)
![](https://img.xkw.com/dksih/QBM/2019/2/3/2132797377822720/2134751854387201/STEM/dc1a8d41ea904ea89c2afef64e72aec9.png?resizew=224)
解:AB∥DC.理由如下:
∵BF,DE分别平行
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
∴_____∥_____(____)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知
,CE平分
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740025877217280/2740183400808448/STEM/2aeb5482-e48e-41c4-823c-e4fcc31faa78.png)
(1)
与EF是否平行,请说明理由;
(2)若DF平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06fd6dd876c57c3c1fbd9ff0dbb34cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989ccdf1ea25cba198385429d9597c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e5b55a7275aee4d9c20bf10703b9ed1.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740025877217280/2740183400808448/STEM/2aeb5482-e48e-41c4-823c-e4fcc31faa78.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(2)若DF平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa783be67f9c5bb06c08796ce22f82c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c73414d71dd14a80f4d7856c744b9ed.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,半圆的直径
,弦
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/c7cd2e1e-e455-4d1c-b34e-3d7368f9a50b.png?resizew=172)
(1)求证:
;
(2)当
的面积最大时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e6cd567924fa5026ef954c78fc7b33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/c7cd2e1e-e455-4d1c-b34e-3d7368f9a50b.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949927ca2b3e98103f9b7edf05013dd3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图1,油纸伞是中国传统工艺品之一,起源于中国的一种纸制或布制年,油纸伞的制作工艺十分巧妙,如图2,伞圈
沿着伞柄
滑动时,总有伞骨
,从而使得伞柄
始终平分同一平面内两条伞骨所成的
.为了说明这一制作方法的正确性,需要对其进行证明.如下给出了不完整的“已知”和“求证”,请补充完整,并写出 “证明 ”过程
已知:如图2,点
,
,
,
在同一平面内,___________,_____________.
求证:_________________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f927a4d4a36951092416b8680a9a5405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
已知:如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
求证:_________________.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/01754760-0b22-47ed-bab1-8dc445c32a18.png?resizew=311)
您最近一年使用:0次