在三角形纸片
中,
,点D为
边上靠近点C处一定点,点E为
边上一动点,沿
折叠三角形纸片,点C落在点
处,①如图1,当点
落在
边上时,
;②如图2,当点
落在
内部时,
;③如图3,当点
落在
上方时,
;④当
时,
或
,以上结论正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15794c925ff0b11ca40323494454ae6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb29e2458267ac44c3462ee115252edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dacef990760213815e2ac9e765f699ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7966ad02ebd8b59921b1de34b33d0afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2e4774d4438243a00d0fef659f1b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eeded08e11d4827114f81b790bb5efc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5aa24027d7ae2c04ac1bbb11855fd.png)
A.1 | B.2 | C.3 | D.4 |
更新时间:2024-05-25 20:53:20
|
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【推荐1】如图,已知
,
平分
,
,
在
上,
在
上,
在
上.当
取最小值时,此时
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/6968f5b8-a0d3-454f-9400-ece2bc541657.png?resizew=206)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,
,点D是BC上一点,BD的垂直平分线交AB于点E,将
沿AD折叠,点C恰好与点E重合,则
等于( )
![](https://img.xkw.com/dksih/QBM/2021/12/28/2883672875229184/2896985558564864/STEM/9b71fb55-9e2f-4999-a937-f2681117c4a7.png?resizew=271)
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A.19° | B.20° | C.24° | D.25° |
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【推荐1】如图,
中,
,点M,N分别在
上,将
沿直线
翻折,点A的对应点D恰好落在
边上(不含端点B,C),下列结论中不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.直线![]() ![]() | B.![]() |
C.![]() | D.若M是![]() ![]() |
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【推荐2】如图1,在△ABC中,∠ACB =90°,∠CAB= 30°,△ABD是等边三角形. 如图2,将四边形ACBD折叠,使D与C重合,EF为折痕,则∠ACE的正弦值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】如图,在
中,
和
的平分线
,
交于点
,
交
于点
,
交
于点
,连接
.过点
作
于点
,若
,
,
,
,现给出以下结论:①
;②
;③
;④当
时,
;⑤当
时,
;其中,正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/027a7283-287c-4f23-b868-98723d41fdfa.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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A.2 | B.3 | C.4 | D.5 |
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【推荐2】如图,在△OAB和△OCD中,OA=OB,OC=OD,OA>OC,∠AOB=∠COD=40°,连接AC,BD交于点M,连接OM.下列结论:①AC=BD;②∠AMB=40°;③OM平分∠BOC;④MO平分∠BMC.其中正确的是( )
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