如图,已知
,
.
试说明:
.(要求:推理过程要完整,并且每一步要注明理由根据)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efaf7b390077d8c7d0540bac6ddee37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1af62a31d2a34d735c9b9a9035e2633.png)
23-24七年级下·山东临沂·期中 查看更多[3]
山东省临沂市平邑县2023-2024学年七年级下学期期中数学试题(已下线)安徽省七年级数学下学期期末模拟试卷02-2023-2024学年七年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(沪科版)(已下线)暑假作业02 平行线的判定与性质(知识梳理+三大题型专练+能力拓展练)-【暑假分层作业】2024年七年级数学暑假培优练(人教版)
更新时间:2024-06-20 07:17:26
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【推荐1】如图,若
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名校
【推荐2】如图,
于点
,
于点
,
,
,请问
与
平行吗?请完成下面的推理过程,并在括号内写出推理依据.
.理由如下:
因为
,
,(已知)
所以
( )
所以
,( )
所以
.( )
因为
,(已知)
所以
________,( )
所以
,( )
又因为
(已知)
所以
.( )
所以
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779269f1a17e5eccd41f9f5d64b29e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6010d78c8fd2fc4f5f2200cbb1adb5b.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a954c928adea72745355a94ad53a899a.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021ee075894e90345aae867377f271f0.png)
所以
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因为
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所以
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所以
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所以
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所以
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【推荐1】如图,AE、CE 分别平分∠BAC、∠ACD 且∠1+∠2=90°,试说明 AB∥CD 的理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/86861197-eb6e-4ec2-a14a-d68536a1b49c.png?resizew=203)
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【推荐2】根据下图,完成下列推理过程.
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225504145645568/2225573486854144/STEM/a22c0005e33845a19598da7de88b9471.png?resizew=151)
(1)∵∠1=∠A(已知), ∴AD∥BC
.(________________________________________________________)
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.(________________________________________________________)
(3)∵∠2=∠5(已知),∴AD∥BC
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(4)∵∠ADC+∠C=180°(已知),∴AD∥BC
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(1)∵∠1=∠A(已知), ∴AD∥BC
.(________________________________________________________)
(2)∵∠3=∠4(已知),∴CD∥AB
.(________________________________________________________)
(3)∵∠2=∠5(已知),∴AD∥BC
.(________________________________________________________)
(4)∵∠ADC+∠C=180°(已知),∴AD∥BC
.(________________________________________________________)
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【推荐2】如图,直线a∥b,直线c∥d,∠1=60°;求∠2的度数.
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【推荐1】阅读下列文字,并完成证明.
已知
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证明:∵
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(____________________),
∵
(已知),
∴
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∴______
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【推荐2】如图,已知
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(已知)
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所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
所以
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cafbfb3f7844d1073e7f3b6d9643986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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又
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