在
中,
,添加下列一个条件后,仍不能判定
为等边三角形的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-03-30 11:58:33
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【推荐1】如图,在等腰
中,
,分别以点
点
为圆心,大于
为半径画弧,两弧分别交于点
和点
,连接
,直线
与
交于点
,连接
,则
的度数是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73df61207bc10d2fa109d73d705fbfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/60ef95894ceebaf236170e8832dcf7e3.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在直角
中,
,
,垂足为D,
与
关于直线AD对称,点B的对称点是点
,若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/5deaaacd-eaab-4373-b268-688faff88d48.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/5deaaacd-eaab-4373-b268-688faff88d48.png?resizew=214)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,若
,则下列结论中不一定成立 的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03a43549ab71f0998fffbcb48397b00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/c2c3099e-a55e-4868-aa9d-608a9857ea05.png?resizew=165)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在△DEF中,∠D=90°,GE=3DG,GE=GF,Q是EF上一动点,过点Q作QM⊥DE于M,QN⊥GF于N,
,则
的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/f29d64d1-c362-467e-b554-492fe94234f2.png?resizew=255)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbc2025077fbc6922067afc766e1b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eafac18c184a5ed50875d7ab466fcc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/f29d64d1-c362-467e-b554-492fe94234f2.png?resizew=255)
A.定值4 | B.定值![]() | C.不确定 | D.定值![]() |
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【推荐1】下列推理正确的是( )
A.∵等腰三角形是轴对称图形 ,又∵等腰三角形是等边三角形,∴等边三角形是轴对称图形 |
B.∵轴对称图形是等腰三角形, 又∵等边三角形是等腰三角形,∴等边三角形是轴对称图形 |
C.∵等腰三角形是轴对称图形 ,又∵等边三角形是等腰三角形,∴等边三角形是轴对称图形 |
D.∵等边三角形是等腰三角形, 又∵等边三角形是轴对称图形,∴等腰三角形是轴对称图形 |
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【推荐2】若二次函数
的图象与
轴交于
和
两点,顶点为
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的度数为( )
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