如图,BD是
的角平分线,点E在边AB上,且
,
.
(1)若
,求DE的长;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645862407995392/2645874566053888/STEM/d0ef4217-c2ec-46c6-86e5-a96a41ea2a05.png)
更新时间:2021-01-28 15:08:29
|
【知识点】 等腰三角形的性质和判定
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在等腰△ABC中,顶角的平分线BD交AC于点D,AD=3,作△ABC的高AE交CB的延长线于点E,且AE与BC的长是方程组
的解.已知S△ABC=
m(m≠0),求△ABC的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce7278886a0bbb69f1e4c80df6c7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb16d1089cf194d658387742e1c2a93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/3f7f3e3b-1ef4-4fbf-850d-86d0977c409f.png?resizew=236)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,
三个顶点的坐标分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070b5c081d1808f3c128eca8783c5fdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/8e92e45d-c2be-40a6-bc7a-ed912dc27ac7.png?resizew=281)
(1)若
与
关于y轴成轴对称,在图中画出
,
点坐标为__________;
(2)若直线
与y轴相交于点
,在y轴上是否存在点Q.使得
,如果存在,求出点Q的坐标,如果不存在,说明理由;
(3)在x轴上找一点P,使
的值最小,点P的坐标是____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070b5c081d1808f3c128eca8783c5fdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/8e92e45d-c2be-40a6-bc7a-ed912dc27ac7.png?resizew=281)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7831e5fa3e63e0ea1dc124ec0ca127cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d303a0dc7aa182de9bd34a7fbe4d14.png)
(3)在x轴上找一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
您最近一年使用:0次