已知:如图,在
中,过
的中点O的直线分别交
,
的延长线于点E,F.
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119299828006912/3119638054895616/STEM/e16756f73c7f4f4f9c09962bfb60fbdb.png?resizew=110)
21-22八年级下·全国·课后作业 查看更多[1]
(已下线)【浙教版课时练习】八年级下册 4.2 平行四边形及其性质
更新时间:2022-11-28 23:42:46
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适中
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【推荐1】如图,在平面直角坐标系中,∠AOB=90°, OA=OB, 若点A的坐标为(-1,4),求点B的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/9a54cada-4e1e-4466-9407-2a77c5cf6ad2.png?resizew=173)
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解答题-证明题
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适中
(0.65)
【推荐2】如图1,在正方形
中,点E在
上,点F在
的延长线上,
.
![](https://img.xkw.com/dksih/QBM/2023/4/24/3223239417094144/3232071884521472/STEM/28be5c584d9446e0b7aa0d528dc73492.png?resizew=375)
(1)求证:
;
(2)连接
,若
,请利用图2验证勾股定理.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://img.xkw.com/dksih/QBM/2023/4/24/3223239417094144/3232071884521472/STEM/28be5c584d9446e0b7aa0d528dc73492.png?resizew=375)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f501137809dba21dfab7dd56f68f7.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075933b8c02f5df533820f0a93d5f590.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在▱ABCD中,点E在BC边上,点F在DC的延长线上,且∠DAE=∠F.
(1)求证:△ABE∽△ECF;
(2)若AB=3,AD=7,BE=2,求FC的长.
(1)求证:△ABE∽△ECF;
(2)若AB=3,AD=7,BE=2,求FC的长.
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183582180245504/2185247853395968/STEM/6963ea37f5174211a40da93afe60540a.png?resizew=237)
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适中
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【推荐2】如图,将平行四边形ABCD沿对角线BD进行折叠,折叠后点C落在点F处,DF交AB于点E.
![](https://img.xkw.com/dksih/QBM/2015/7/20/1573877704278016/1573877710462976/STEM/c6eea10b3bd9448e90609a5bd935a46a.png?resizew=209)
(1)求证:
;
(2)判断AF与BD是否平行,并说明理由.
![](https://img.xkw.com/dksih/QBM/2015/7/20/1573877704278016/1573877710462976/STEM/c6eea10b3bd9448e90609a5bd935a46a.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09eed8a5e7efe213d63327a1e23d5524.png)
(2)判断AF与BD是否平行,并说明理由.
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