如图,等边
中,
,
为
中点,
,
为
边上动点,且
,则
的最小值是( )
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694606074052608/2700896633864192/STEM/174f7b6b-95f6-414e-bd16-84e5456d903e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2bb91b0a9ff9a5d2f4bb0d3687466a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b402fbb5f414185b3b4f32d6ca4682c9.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694606074052608/2700896633864192/STEM/174f7b6b-95f6-414e-bd16-84e5456d903e.png)
A.![]() | B.![]() | C.![]() | D.15 |
2021·安徽·二模 查看更多[6]
2021年安徽中考预测二模数学试题(已下线)专题15 等腰三角形与直角三角形-备战2021年中考数学考点 核心考点清单(广东专用)(已下线)专题18.21 平行四边形最短路径问题(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题4.27 平行四边形最值问题(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题19.24 平行四边形最短路径问题(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(沪科版)(已下线)专题6.24 平行四边形最值问题(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
更新时间:2021-04-16 08:51:10
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单选题
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解题方法
【推荐1】如图,
中,
,
,垂足为
,若
,
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/e3241088-68df-42f4-a090-7fcb037344ec.png?resizew=265)
A.![]() | B.![]() | C.![]() | D.4 |
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【推荐2】如图,在△ABC中,DC平分∠ACB,BD⊥CD于点D,∠ABD=∠A,若BD=1,AC=7,则tan∠CBD的值为( )
A.5 | B.![]() | C.3 | D.![]() |
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【推荐1】如图,在平行四边形
中,
平分
,交
于点
且
,延长
与
的延长线相交于点
,连接
、
.下列结论:①
;②
是等边三角形;③
;④
;⑤
;其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474586067746816/2476118405734400/STEM/31bfa9c830824c3db3024815258796dd.png?resizew=245)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,在平行四边形
中,点
在边
上,将
沿着直线
翻折得到
,点
的对应点
恰好落在线段
上,线段
的延长线交边
于点
,如果点
为边
的中点,则
的值为( )
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【推荐1】如图,在△ABC中,∠ABC=90°,∠A=30°,BC=1. M、N分别是AB、AC上的任意一点,求MN+NB的最小值为( )
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【推荐2】如图,在 △ABC中,AB=AC=5,BC=6,AD⊥BC于D,点E,F分别在AD,AB是,则BE+EF的最小值是( )
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A.4 | B.4.8 | C.5 | D.5.4 |
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