完成下面的证明.
已知:如图,
,
.
求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/186a7027-5ce5-46f1-98d4-e7ab860cb0a7.png?resizew=151)
证明:∵
(已知),
(__________),
∴
(等量代换)
∴
(同旁内角互补,两直线平行),
∴
(___________________),
∵
(已知),
∴
(_________________),
∴
(______________________).
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/186a7027-5ce5-46f1-98d4-e7ab860cb0a7.png?resizew=151)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e656bb343181eef14d4297b84af5dd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d11b492476926aaea82de48e28282a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149a8ad771af6648b1b26b1973834f44.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab56b75468688e8a5b8f1f5b748501db.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb562533a6321d095ff7539a2df9e1ff.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
更新时间:2022-06-29 18:48:00
|
【知识点】 根据平行线判定与性质证明
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】填空:(将下面的推理过程及依据补充完整)
如图,已知:
平分
,
,
,求证:
平分
.
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631051391074304/2633935982698496/STEM/9e4e601fcd984f24baae7081d060943e.png?resizew=186)
证明:∵
平分
(已知),
(角平分线的定义),
(已知),
____(两直线平行,内错角相等)
(等量代换),
(已知),
∴_____
(_________);
(__________),
∴__________=__________(等量代换),
平分
(______________).
如图,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e8e59609f1c42d1aff0008ec23f31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c989f9f584fef670cb759e0a83923a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631051391074304/2633935982698496/STEM/9e4e601fcd984f24baae7081d060943e.png?resizew=186)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b895cda1a909f69766ca6e046173a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c81ff696bd6653cfbe798b85051676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c075720d29b58042336f84aa53212a91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3351d20c80c71a0a07088bb92ff1bc41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94204d4b97b6d53661204a953d78eec9.png)
∴_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2383316308ad0e41faab681929f41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191496af8433cf76fc6fc93ecfc98479.png)
∴__________=__________(等量代换),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a21cbe3ed081aecbb8560eaad34023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,D,E,F分别为
的边
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;
(2)若
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的面积为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746ee1515a178948b04f535705c6f738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4661992139e93978e4f23a4f82476d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65cbc3bddc00e54611203f2cbdbd6a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49c6ea06946025b893a86284cbe7e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09dfa01bffe6f5d08931c75970c16b69.png)
您最近一年使用:0次