如图,在等边△ABC中,D为AC边上的一点,连接BD,M为BD上一点,且∠AMD=60°,AM交BC于E.当M为BD中点时,
的值为( )
![](https://img.xkw.com/dksih/QBM/2017/5/31/1698893318807552/1699265209475072/STEM/74cb5b3a-8589-41df-932a-d9d32dc8e4ed.png?resizew=119)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5713f55f8d1bd3d257ea68fe09c6c227.png)
![](https://img.xkw.com/dksih/QBM/2017/5/31/1698893318807552/1699265209475072/STEM/74cb5b3a-8589-41df-932a-d9d32dc8e4ed.png?resizew=119)
A.![]() | B.![]() | C.![]() | D.![]() |
2017·江西赣州·一模 查看更多[6]
江西省赣州市信丰县2017年普通高中提前招生考试数学试题人教版2018年 九年级数学下册 期末培优试题人教版九年级下册 第二十七章 相似单元练习题2人教版数学九年级下册第二十七章相似单元检测题(已下线)专题6.4.1 探索三角形相似的条件(1)-2021-2022学年九年级数学下册链接教材精准变式练(苏科版)(已下线)专题6.19 作平行线求相关线段长或比值(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)
更新时间:2017-06-01 05:06:49
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【推荐1】我国汉代数学家赵爽为了证明勾股定理,创造了“赵爽弦图”,图1是由四个全等的直角三角形围成的一个大正方形,中间是一个小正方形.连接图1中相应的顶点得到图2,记阴影部分的面积为
,空白部分的面积为
,若大正方形的边长为
,
,则小正方形的边长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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【推荐2】下列说法中,正确的有( )
①一个三角形的两边长分别是5和6,则第三边长的最大整数值是10;
②全等的两个三角形对应边上的中线相等;
③无论
为何值时,
一定成立;
④如图,直线
是
中
边的垂直平分线,点
是直线
上的一动点.若
,则
周长的最小值是10.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/404a77d2-06d2-4e89-919a-67557a3d73f8.png?resizew=198)
①一个三角形的两边长分别是5和6,则第三边长的最大整数值是10;
②全等的两个三角形对应边上的中线相等;
③无论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be96aa499d3281dbfa17b0f18748b618.png)
④如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248e71484d70bbe1bcf3acce65a095ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
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【推荐1】在△ABC中,AB=AC,AB>BC,点D在边BC上,CD=2BD,点E、F在线段AD上,∠1=∠2=∠BAC,若△ABC的面积为18,则△ABE与△CDF的面积之和是( )
![](https://img.xkw.com/dksih/QBM/2019/11/27/2342796660948992/2345093866307585/STEM/5806457f2f82435b81103418e20a26ad.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/2019/11/27/2342796660948992/2345093866307585/STEM/5806457f2f82435b81103418e20a26ad.png?resizew=195)
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名校
【推荐2】如图,正方形
中,
,
分别为
,
上的点,
,
交
于点
,
交
于点
,
为
的中点,
交
于点
,连接
.下列结论:①
;②
;③
;④
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268648745803776/2268736267993088/STEM/4c1506c0-61d8-4c55-8035-c223ee469871.png?resizew=166)
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【推荐1】如图,在
中,
.点
是
边的中点,点
在线段
上,过点
作
交
于点
,连接
,设
,
的面积为
,则能表示
与
函数关系的大致图象是( )
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712453574811648/2717414230482944/STEM/d0664a58-db40-4799-8225-394c7dcaba62.png)
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