如图1,在△ABC中,∠C=90°,延长CA至点D,使AD=AB.设F为线段AB上一点,连接DF,以DF为斜边作等腰Rt△DEF,且使AE⊥AB.
(1)求证:AE=AF+BC;
(2)当点F为BA延长线上一点,而其余条件保持不变,如图2所示,试探究AE、AF、BC之间的数量关系,并说明理由.
(1)求证:AE=AF+BC;
(2)当点F为BA延长线上一点,而其余条件保持不变,如图2所示,试探究AE、AF、BC之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/1a484fd2-ee4e-4897-8e62-e4998d7f32b5.png?resizew=447)
更新时间:2020-01-11 19:24:20
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【知识点】 全等三角形综合问题
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解答题-问答题
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【推荐1】已知:如图1,在平面直角坐标系中,点
,且
,
的面积为16,点P从C点出发沿y轴正方向以1个单位/秒的速度向上运动,连接
.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895690904281088/2897070500552704/STEM/5dbc3d25-3a52-4dc9-abd3-947d9765408b.png?resizew=325)
(1)求出A、B、C三点的坐标;
(2)如图2,若
,以
为边作等边
,使
与
位于
的同侧,直线
与y轴、直线
交于点E、F,请找出线段
、
、
之间的数量关系(等量关系),并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2438238235c5e19c342f162296880e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9032f0bc61c768f97dbd3f7733caa3c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d6efca23a04c9c25e8d6c8ccd78e73.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2895690904281088/2897070500552704/STEM/5dbc3d25-3a52-4dc9-abd3-947d9765408b.png?resizew=325)
(1)求出A、B、C三点的坐标;
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c28232ff5cb5034a1c9753b29fc6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-证明题
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适中
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【推荐2】已知:如图,△RPQ中,RP=RQ,M为PQ的中点.
![](https://img.xkw.com/dksih/QBM/2018/1/22/1865784092237824/1866578168184832/STEM/01ed8a5f259c417596e958e3928b6b09.png?resizew=171)
求证:RM平分∠PRQ.
证明:∵ M为PQ的中点(已知),
∴______=_______
在△______和△______中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91df00627a1d583152c6d1f1c7f288d.png)
∴______≌______( ).
∴ ∠PRM=______ ( ).
即RM平分∠PRQ.
![](https://img.xkw.com/dksih/QBM/2018/1/22/1865784092237824/1866578168184832/STEM/01ed8a5f259c417596e958e3928b6b09.png?resizew=171)
求证:RM平分∠PRQ.
证明:∵ M为PQ的中点(已知),
∴______=_______
在△______和△______中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91df00627a1d583152c6d1f1c7f288d.png)
∴______≌______( ).
∴ ∠PRM=______ ( ).
即RM平分∠PRQ.
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