请补全下面的证明过程:
如图,已知
,
,求证:
.
证明:∵
(已知),
∴________
________(________________________),
∴
(________________________),
又∵
(已知),
∴
________(等量代换),
∴
(________________________).
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3233c5b586659e7f4b2e3f1c585031be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/311e831c-ec6b-47c6-a24b-3bf0c490ca6d.png?resizew=185)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41eb2ae18a590592d7037ec9ac98db97.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3233c5b586659e7f4b2e3f1c585031be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
更新时间:2023-08-03 21:16:47
|
【知识点】 根据平行线判定与性质证明
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解答题-作图题
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较易
(0.85)
【推荐1】已知在
方格纸中,每个小格均为边长是
的正方形,
的位置如图所示,请按照要求完成下列各题:
(1)请在图
中将
平移,使点
落在
,得到
,画出
.
(2)请在图
中标出格点
不与
重合
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a96e9c2e2a15130d1d56a1d0e16b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/32a784c8-ab41-4de0-b3f8-b608b2f47604.png?resizew=366)
(1)请在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)请在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ac58049f0de1685e23303e188a2454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c389effa215536d7c6c6b946312b9ef.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】如图,点E在直线DF上,点B在直线AC上,若∠1=∠2,∠3=∠4,则∠A=∠F,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/4/2950691442737152/3062947299352576/STEM/be1c3059ac9d4f8eae3be67f57cc4315.png?resizew=158)
解:∵∠1=∠2(已知),∠2=∠DGF (___),
∴∠1=∠DGF,
∴BD
CE (____),
∴∠3+∠C=180° (____).
又∵∠3=∠4(已知),
∴∠4+∠C=180°,
∴____
DF(同旁内角互补,两直线平行),
∴∠A=∠F (____).
![](https://img.xkw.com/dksih/QBM/2022/4/4/2950691442737152/3062947299352576/STEM/be1c3059ac9d4f8eae3be67f57cc4315.png?resizew=158)
解:∵∠1=∠2(已知),∠2=∠DGF (___),
∴∠1=∠DGF,
∴BD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠3+∠C=180° (____).
又∵∠3=∠4(已知),
∴∠4+∠C=180°,
∴____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠A=∠F (____).
您最近一年使用:0次