在四边形
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/9ea887b5-0872-45aa-8d9a-03a3b5d23e89.png?resizew=377)
图1 图2
(1)若
的两边分别与边
相交于点E、F,连接
,如图1,求证:
;
(2)如果
的两边与边
的延长线分别相交于点E、F,连接
,如图2,那么(1)中的结论是否仍然成立?若成立,请证明;若不成立,则
长度之间满足怎样的等量关系,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59281d3136f2c67c078d98842171224d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/9ea887b5-0872-45aa-8d9a-03a3b5d23e89.png?resizew=377)
图1 图2
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24dfa37067ff455888ebe076eeb1fb2.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172a5167d675937845d7c885c84a164c.png)
更新时间:2024-03-10 18:06:13
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