将矩形纸片
沿过点
的直线折叠,使点
落在
边上的点
处,折痕为
(如图①);再沿过点
的直线折叠,使点
落在
上的点
处,折痕为
(如图②);再展平纸片(如图③).![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718507948752896/2786890114867200/STEM/fb175a06dea64ec5b9dd9427f97daf23.png?resizew=488)
(1)判断
的形状并加以证明;
(2)用等式表示图③中
与
之间的数量关系是:______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad5aaf0b9ec9af8ba7608c4f2e1ac27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718507948752896/2786890114867200/STEM/fb175a06dea64ec5b9dd9427f97daf23.png?resizew=488)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb936e02a02c16c586d4463b5ca05191.png)
(2)用等式表示图③中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d335bf8cb2e6e5e50d0e03a14d1f48d4.png)
更新时间:2021-08-15 20:45:21
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相似题推荐
解答题-证明题
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【推荐1】如图,已知直线l与⊙O相离,OA⊥l于点A,交⊙O于点P,OA=5,AB与⊙O相切于点B,BP的延长线交直线l于点C.
(1)求证:AB=AC;
(2)若
,求⊙O的半径.
(1)求证:AB=AC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6914d401b0e7099dbea8ebdd5052ee7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/1774546a-3645-41aa-988f-6e78b72db491.png?resizew=179)
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解答题-作图题
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【推荐2】【阅读理解】
课外兴趣小组活动时,老师提出了如下问题:
如图1,
中,若
,
,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法:延长
到点E,使
,请根据小明的方法思考:
(1)由已知和作图能得到
的理由是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
的取值范围是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)【问题解决】
如图2,
是
的中线,
交
于E,交
于F,且
.求证:
.
课外兴趣小组活动时,老师提出了如下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/dabc8e07-686f-4425-9abd-df2288ebea30.png?resizew=333)
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
(1)由已知和作图能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e101f2ad5cbdb169f866f0ea82f897.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f863e3893cda99d0a42b469f9b0438cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145a085312b8fa4af76b85fd7669413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7f502effec463bec4889245c4f09a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)【问题解决】
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
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【推荐1】如图,将长
.宽
的长方形纸片
折叠使点
与
重合,折痕为
,则
长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babf22605cb87aea5d039e8f53df03ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f0f959e977c9b208899439e5bc1ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/b49d1c7c-0096-43d6-b16c-f629352b96ce.png?resizew=184)
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【推荐2】在矩形
中,E为
边上一点,把
沿
翻折,使点D恰好落在
边上的点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/030c6c03-da1a-469f-bf78-db9f2f8b4595.png?resizew=134)
(1)求证:
;
(2)若
,
,求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/030c6c03-da1a-469f-bf78-db9f2f8b4595.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d06413db0b477e8aaf423467f5769.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2301d56094e26fb485d29606251737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1407b7cd3f90692652e253f0616097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐1】如图,在正方形
中,
,点
是正方形外一点,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/9/10/2546736042942464/2548052943273984/STEM/9d5e87a5e9ce4099ba2893e75bf9c532.png?resizew=137)
(1)求
的度数;
(2)求
的长度;
(3)求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d179eeebf3b3629556548f8ac26be975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69e1d4d3990a80abb69c4b123999ca5.png)
![](https://img.xkw.com/dksih/QBM/2020/9/10/2546736042942464/2548052943273984/STEM/9d5e87a5e9ce4099ba2893e75bf9c532.png?resizew=137)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b28b2c71658e936d7bca6dd2d3bdaa.png)
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【推荐2】阅读下面材料:
小伟遇到这样一个问题:如图1,在正三角形ABC内有一点P,且
,
,
,求∠APB的度数.
小伟是这样思考的:如图2,利用旋转和全等的知识构造
,连接
,得到两个特殊的三角形,从而将问题解决.参考小伟同学思考问题的方法,解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/a2cf2d39-73a4-40ce-a725-ab653310f605.png?resizew=438)
(1)请你计算图1中∠APB的度数.
(2)如图3,在正方形ABCD内有一点P,且
,
,
,求∠APB的度数.
小伟遇到这样一个问题:如图1,在正三角形ABC内有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
小伟是这样思考的:如图2,利用旋转和全等的知识构造
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d0f53af0839b0f803e470f0cf42c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/a2cf2d39-73a4-40ce-a725-ab653310f605.png?resizew=438)
(1)请你计算图1中∠APB的度数.
(2)如图3,在正方形ABCD内有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
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