如图,在△ABC中,AC=2
,∠ABC=45°,∠BAC=15°,将△ABC沿直线AC翻折至△ABC所在的平面内,得△ADC.过点A作AE,使∠EAD=∠DAC,与CD的延长线交于点E,则线段ED的长为( )
![](https://img.xkw.com/dksih/QBM/2021/7/3/2756035097501696/2783044032159744/STEM/1f94f850-7148-43d0-b162-201f8a0ca7a5.png?resizew=194)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/3/2756035097501696/2783044032159744/STEM/1f94f850-7148-43d0-b162-201f8a0ca7a5.png?resizew=194)
A.2![]() ![]() | B.2![]() ![]() | C.2![]() ![]() | D.3![]() ![]() |
更新时间:2021-08-10 10:20:29
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【推荐1】如图所示,把多块大小不同的
角三角板,摆放在平面直角坐标系中,第一块三角板
的一条直角边与
轴重合且点
的坐标为
,
,第二块三角板的斜边
与第一块三角板的斜边
垂直且交
轴于点
,第三块三角板的斜边
与第二块三角板的斜边
垂直且交
轴于点
,第四块三角板斜边
与第三块三角板的斜边
垂直且交
轴于点
,按此规律继续下去,则点
的坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/04042dca-ed86-40d0-9084-815f3369d010.png?resizew=198)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】如图,
,点B在射线
上,
.点P在射线
上运动(点P不与点A重合),连接
,以点B为圆心,
为半径作弧交射线
于点Q,连接
.若
,则下列图象中,能表示y与x的函数关系的图象大致是( )
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730627332521984/2730682495967232/STEM/11d4e226-f40b-4d70-8142-53d69d667a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3181e58f09e9fec4e43e422b82831b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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C.![]() | D.![]() |
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【推荐1】如图,△ABC的周长为19,点D,E在边BC上,∠ABC的平分线垂直于AE,垂足为N,∠ACB的平分线垂直于AD,垂足为M,若BC=7,则MN的长度为( )
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【推荐2】如图,在平面直角坐标系中,一次函数
的图象与
轴交于点
,与
轴交于点
,点
在线段
上,
轴于点
,则
周长的最小值为( ).
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610528111394816/2614087885144064/STEM/79f02147-af95-4637-be44-111b45b0f733.png?resizew=227)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fceb9eb57ca36db386ffafeda213599c.png)
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【推荐1】如图,
为
的对角线,
,
于点E,
于点F,
、
相交于点H,直线
交线段
延长线于点G,下列结论:①
;②
;③
;④若
,则
其中正确的结论有( )个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图,在矩形
中,
,点P,Q分别在
上,
,线段
在
上,且
,连接
,则
的最小长度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,在
中,
,
,点D是边
上的一点,
交
于点E,将
沿
翻折得到
,设
的长为x,
与四边形
重叠部分的面积为S,则S与x之间的函数关系的图象大致是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/e904a71d-9ecf-41fb-934b-1196e314d3b8.png?resizew=148)
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【推荐2】如图(1)所示为长方形纸带,将纸带沿EF折叠成图(2);再沿BF折叠成图(3);继续沿EF折叠成图(4)按此操作,最后一次折叠后恰好完全盖住∠EFG,整个过程共折叠了9次,问图(1)中∠DEF的度数是( )
A.20° | B.19° | C.18° | D.15° |
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