如图,把
纸片沿
折叠,当点
落在四边形
的外部时,则
与
和
之间有一种数量关系始终保持不变,请试着找一找这个规律,你发现的规律是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2024-05-01 21:53:20
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【推荐1】满足下列条件的△ABC中,不是直角三角形的是( )
A.∠A:∠B:∠C=1:2:3 |
B.∠A+∠B=∠C |
C.∠A:∠B:∠C=3:4:5 |
D.一个外角等于和它相邻的内角 |
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【推荐2】把一副三角板按如图叠放在一起,则
的度数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/3/13/2159442607095808/2161139201089536/STEM/619cc104e5154544bec1eaed1e213386.png?resizew=164)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2578ce50ea905e7c717199da9ef8630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/3/13/2159442607095808/2161139201089536/STEM/619cc104e5154544bec1eaed1e213386.png?resizew=164)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在
中,
,将
沿
折叠,点
落在
边上的点
处,
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b4e9b8d1414ca53f09b110e8fbc5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dffa15b6de72949dc95da14c2f76779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f2e07c7d33985d4b447f87cabe16cb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在△ABC中,∠A=30°,∠B=50°,将点A与点B分别沿MN和EF折叠,使点A、B与点C重合,则∠NCF的度数为( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/82d386ca-ba86-4739-b951-6665b5efaea2.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/82d386ca-ba86-4739-b951-6665b5efaea2.png?resizew=197)
A.22° | B.21° | C.20° | D.19° |
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