(1)已知△ABC是直角三角形,∠BAC=90°,AB=AC,直线l经过点A,分别从点B、C向直线l作垂线,垂足分别为D、E.当点B,C位于直线l的同侧时(如图1),易证△ABD
△CAE.如图2,若点B,C在直线l的两侧,其它条件不变,△ABD
△CAE是否依然成立? (填成立或若不成立)
(2)变式一:如图3,△ABC中,AB=AC,直线l经过点A,点D、E分别在直线l上,点B、C位于l的同一侧,如果∠CEA=∠ADB=∠BAC,求证:△ABD
△CAE.
(3)变式二:如图4,△ABC中,依然有AB=AC,若点B,C位于l的两侧,如果∠BDA+∠BAC=180°,∠BDA=∠AEC,求证:BD=CE+DE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef921a51dbb1652ba44bf088048b736b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef921a51dbb1652ba44bf088048b736b.png)
(2)变式一:如图3,△ABC中,AB=AC,直线l经过点A,点D、E分别在直线l上,点B、C位于l的同一侧,如果∠CEA=∠ADB=∠BAC,求证:△ABD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef921a51dbb1652ba44bf088048b736b.png)
(3)变式二:如图4,△ABC中,依然有AB=AC,若点B,C位于l的两侧,如果∠BDA+∠BAC=180°,∠BDA=∠AEC,求证:BD=CE+DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/388b600b-c7d7-4a10-8037-12468356afd3.png?resizew=412)
更新时间:2022-10-14 10:04:41
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