1 . 我们定义:最大边与最小边的比为5:3的三角形叫做“[5,3]型三角形”,最长边称为“弦边”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/58d0357e-f592-4e7b-a3e9-6207d8d6722f.png?resizew=150)
(1)小张认为:等腰三角形不可能是“[5,3]型三角形”.你认为他的说法正确吗?若正确,请说明理由;若不正确,请举出反例;
(2)若
是“[5,3]型三角形”,
,“弦边”
,则
____;
(3)如图,在
中,
,
.现将
关于直线
作轴对称,点A的对称点为点D,连结
,作
,垂足为P.当
是“[5,3]型三角形”时,求线段
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/58d0357e-f592-4e7b-a3e9-6207d8d6722f.png?resizew=150)
(1)小张认为:等腰三角形不可能是“[5,3]型三角形”.你认为他的说法正确吗?若正确,请说明理由;若不正确,请举出反例;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
(3)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
您最近一年使用:0次
2 . 如图,四边形
是长方形纸片,
,对折长方形纸片
.使
与
重合,折痕为
.展平后再过点B折叠长方形纸片,使点A落在
上的点N,折痕为
,再次展平,连接
,
,延长
交
于点G.有如下结论:①
;②
;③
是等边三角形;④P为线段
上一动点,H是线段
上的动点,则
的最小值是
.其中正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b7ec7c670508d4df2c9b589a1e1cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3432d20e661779ddcefda76afcc2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234cdeeee94033501fca6596894f7b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d1d30450eeeafbb0f3021d53b580a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/70b84c26-d1eb-406f-8495-7050580d5747.png?resizew=198)
您最近一年使用:0次
2023-02-14更新
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336次组卷
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5卷引用:山东省济南市东南片区2022-2023学年八年级上学期期末考试数学试题
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