如图,
和
均为等边三角形,点D在边
上,连接
.求:
(1)
;
(2)猜想线段
,
,
之间的数量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/ac76373f-5e97-4c8b-ba14-6ce769752f48.png?resizew=141)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
更新时间:2023-10-29 11:53:09
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:BA=BD,BC=BE,∠ABC=∠DBE=90°.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847354454622208/2848040332148736/STEM/c77ea1f9-1a64-459e-9a55-93470920176e.png)
(1)如图1,若BA=BC,连接AD、CE,交于点F,证明:∠AFE=90°;
(2)如图2,连接DC、AE,取DC中点G,连接BG,证明:AE=2BG.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847354454622208/2848040332148736/STEM/c77ea1f9-1a64-459e-9a55-93470920176e.png)
(1)如图1,若BA=BC,连接AD、CE,交于点F,证明:∠AFE=90°;
(2)如图2,连接DC、AE,取DC中点G,连接BG,证明:AE=2BG.
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解答题-证明题
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【推荐2】已知:如图所示,E、F分别是平行四边形
的
、
边上的点,且
.
(1)求证:
.
(2)若M、N分别是
、
的中点,连接
、
,
求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26dba530ba1c15d3d3d5f90e0bf2810.png)
(2)若M、N分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ae3c1c4c25e9277470086b34abb63d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/646588b6-08b0-47f1-b0ff-7799e4825890.png?resizew=230)
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解答题-作图题
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适中
(0.65)
名校
【推荐1】等边三角形△ABC,直线1过点C且垂直AC.
![](https://img.xkw.com/dksih/QBM/2020/2/20/2402907264991232/2403245953179648/STEM/25e08d43a3f747c5a8142d521b48328b.png?resizew=190)
(1)请在直线1上作出点D,使得△ABD的周长最小.
(2)在(1)的条件下,连接AD,BD,求证,AD=2BD.
![](https://img.xkw.com/dksih/QBM/2020/2/20/2402907264991232/2403245953179648/STEM/25e08d43a3f747c5a8142d521b48328b.png?resizew=190)
(1)请在直线1上作出点D,使得△ABD的周长最小.
(2)在(1)的条件下,连接AD,BD,求证,AD=2BD.
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知等边三角形
中,点
在
的延长线上,
与
交于点
,且满足
,连接
.
![](https://img.xkw.com/dksih/QBM/2023/2/22/3180393976193024/3180994751889408/STEM/01ffcb46586f45abad0f307b1922659a.png?resizew=294)
(1)若
,
,判断
的形状,并说明理由;
(2)若
.求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2023/2/22/3180393976193024/3180994751889408/STEM/01ffcb46586f45abad0f307b1922659a.png?resizew=294)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dfdfdc2c6e96392db7e9cc0dc29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96379574d51fdc7ead64b98d24b4ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbaeb0eb2480071822676cbf78b0b842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
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