如图,△ABC中,∠ACB=90°,点D是边BC上一点,DE⊥AB于点E,点F在AD上且AF=CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/9b12da1d-333d-41a3-af39-bddd015ab1f7.png?resizew=126)
(1)求证:EF=CF;
(2)若∠B=45°,AD=6,求CE2的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/9b12da1d-333d-41a3-af39-bddd015ab1f7.png?resizew=126)
(1)求证:EF=CF;
(2)若∠B=45°,AD=6,求CE2的值.
22-23八年级上·江苏·周测 查看更多[3]
(已下线)江苏省泰州市姜堰区实验初级中学2022-2023学年八年级上学期数学独立作业10.18(已下线)期末押题培优02卷-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)(已下线)江苏省泰州市姜堰区实验初级中学2023-2024学年八年级上学期数学周测10.17
更新时间:2022-10-19 16:53:56
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【推荐1】已知:如图,
中,
平分
交
于点
,
且
平分
,联结
并延长交边
于点
,说明
的理由.
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解答题-证明题
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【推荐2】△ABC中,∠BAC=90°,点D在AB边上,点E在AC边上,连接DE,取BC边的中点O,连接DO并延长到点F,使OF=OD,连接CF,EF,令
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/ab570d93-21f2-486d-87ae-a3144852b3f2.png?resizew=384)
(1)①如图1,若
,填空:
______;△ECF是______三角形
②如图2,将①中△ADE绕点A旋转,①中的结论是否仍然成立?若成立,请仅就图2所示情况给出证明;若不成立,请说明理由.
(2)如图3,若
,
将△ADE由图1位置绕点A旋转,当点C,E,D三点共线时,请直接写出
的值.
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(1)①如图1,若
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②如图2,将①中△ADE绕点A旋转,①中的结论是否仍然成立?若成立,请仅就图2所示情况给出证明;若不成立,请说明理由.
(2)如图3,若
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【推荐2】如图,在平面直角坐标系中,点B的坐标为
,点E在第二象限,连接BE交x轴于点A,且
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(1)求点E的坐标;
(2)若点
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(3)在(2)的条件下,若
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(1)求点E的坐标;
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解答题-作图题
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【推荐1】如图,
中,D为
边中点,E为
延长线上一点,连接
并延长,使
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/a86b6956-4fc0-4e8d-9a48-c5f74673c2ca.png?resizew=214)
(1)依题意补全图形;
(2)连接
,若
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与
的数量关系,并证明.
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(1)依题意补全图形;
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【推荐2】如图,已知点A是一次函数
图象上一点,过点A作x轴的垂线l,B是l上一点(B在A上方),在AB的右侧以AB为斜边作等腰直角三角形ABC,
(1)若B点坐标是(3,5),反比例函数
的图象过点C.求k的值.
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的图象过点B,C,且△OAB的面积为8,求△ABC的面积.
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(2)若反比例函数
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