题型:解答题-问答题
难度:0.94
引用次数:538
题号:17909731
如图所示,
,
,试说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b333110550208ffce4ec642f78075f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/8cfb5709-f361-40ff-bcb1-6c858d339a07.png?resizew=192)
更新时间:2023-01-19 13:17:19
|
【知识点】 根据平行线判定与性质证明
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解答题-证明题
|
容易
(0.94)
【推荐1】已知:如图,C、D是直线AB上两点,∠1+∠2=180°,DE平分∠CDF,EF∥AB.
(1)求证:CE∥DF;
(2)若∠DCE=126°,求∠DEF的度数.
(1)求证:CE∥DF;
(2)若∠DCE=126°,求∠DEF的度数.
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解答题-问答题
|
容易
(0.94)
【推荐2】填空:(将下面的推理过程及依据补充完整)如图,
已知:
平分
,
,
,那么
平分
吗?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/4be45f75-faa8-4815-8ff8-82c352a29834.png?resizew=231)
解:∵
平分
(已知),
∴ ( ),
∵
(已知),
∴
_________,
∴
(等量代换),
∵ (已知),
∴
(________________________),
(________________________),
∴________________________(等量代换).
∴
平分
.
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/43defd54316aac92a3d18d4d400033c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.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/editorImg/2022/8/15/4be45f75-faa8-4815-8ff8-82c352a29834.png?resizew=231)
解:∵
![](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/43defd54316aac92a3d18d4d400033c2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207c37b4e9eb8c53fd2ae13c7afe92dc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵ (已知),
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cbd57d6ab54b4cb236ac890c19c65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee8c5a326c2bc83d09a9d4a7570df75.png)
∴________________________(等量代换).
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
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