如图,在△ABC中,∠ABC,∠ACB的平分线交于点D,过点D作EF
BC交AB于点E,交AC于点F.若AB=12,AC=8,BC=10,则△AEF的周长是( )
![](https://img.xkw.com/dksih/QBM/2022/9/5/3059966819393536/3069860936179712/STEM/6eb322d2a21d47038b60e48ff90efa22.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/2022/9/5/3059966819393536/3069860936179712/STEM/6eb322d2a21d47038b60e48ff90efa22.png?resizew=137)
A.15 | B.18 | C.20 | D.22 |
更新时间:2022-09-19 15:50:58
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【推荐1】下列命题:①两条直线被第三条直线所截,同位角的平分线互相平行;②直线外一点到这条直线的垂线段,就是这一点到这条直线的距离;③在平面内,过一点有且只有一条直线与已知直线垂直;④在平面内,过一点有且只有一条直线与已知直线平行.其中真命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图:E在线段
上,
、
分别平分
和
,
.设
,
,且
,
的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/984bd77f-4c15-457f-93c1-b50040b2bec9.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42b59b76eafbbe36f13b2daa60132c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b299f5cddf9da033ec3a996f42ae54b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e33ec7353d51de612dda7eb15e06feae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/984bd77f-4c15-457f-93c1-b50040b2bec9.png?resizew=183)
A.5 | B.6 | C.8 | D.7 |
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【推荐1】如图,
和
都是等腰直角三角形,
,
,点
在
上.若
,
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b265d121f9ebc13671a5719604476a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
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A.![]() | B.![]() | C.2.5 | D.![]() |
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【推荐2】如图,等边
中,
,垂足为
,点
在线段
上,
,则下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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