综合与实践课上,刘老师让同学们以“矩形的折叠”为主题开展数学活动.
操作一:对折矩形纸片
,使
与
重合,得到折痕
,把纸片展平;
操作二:在
上选一点
,沿
折叠,使点
落在矩形内部点
处,把纸片展平,连接
,
.
根据以上操作,当点
在
上时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87991d844f9535c970d916e88f6f6687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e1318d014f1911f1259a19c7b50b8b.png)
(2)迁移探究
爱动脑的小明同学将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片
按照(1)中的方式操作,并延长
交
于点
,连接
.
①如图2,当点
在
上时,
;
②改变点
在
上的位置(点
不与点
,
重合),如图3,判断
的度数,并说明理由.
(3)拓展应用
在(2)的探究中,已知正方形纸片
的边长为
,当
时,直接写出
的长.
操作一:对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
根据以上操作,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87991d844f9535c970d916e88f6f6687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e1318d014f1911f1259a19c7b50b8b.png)
(2)迁移探究
爱动脑的小明同学将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
①如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b782f7763233865373b80b266223817f.png)
②改变点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
(3)拓展应用
在(2)的探究中,已知正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18d012a26bb4f9283a64b02d9ee110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
23-24八年级下·河南洛阳·期中 查看更多[3]
河南省洛阳市西工区2023-2024学年八年级下学期期中数学试题河南省洛阳市洛龙区2023-2024学年八年级下学期期中数学试题(已下线)清单02 中心对称图形-平行四边形 全章复习(2个考点梳理+10种题型解读)-2023-2024学年八年级数学下学期期末考点大串讲(苏科版)
更新时间:2024-06-16 16:38:37
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐1】如图
,已知
为
的直径,点
为
的中点,点
在
上,连接
、
、
、
、
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/6fa51994-eb97-4f40-83f4-8c726aeaef6c.png?resizew=436)
(1)求证:
;
(2)如图2,过点C作
的垂线,分别与
,
,
相交于点F、G、H,求证:
;
(3)如图3,在(2)的条件下,连接
,若
,
的面积等于3,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/6fa51994-eb97-4f40-83f4-8c726aeaef6c.png?resizew=436)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51efa0f1a8377f4a1641e1cf7714607.png)
(2)如图2,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e8b8dc232a88228f377b7782db172.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680b53673467d5e29454148104e32fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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【推荐2】如图,
是正方形
的对角线,点
是
的中点,点
是
上一点,连接
于点
交
于点
连接
.
求证:(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4028c70530947feca7dcbf8abb0a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e4ca8b58be33aa0b01f29308367f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8fbc229c957487495bb8cda1d4cfd8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139c0ae68e597571ba72ef727fa9222c.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f33b4d1b953d993610a2d44acac72ff.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731016f5081dca7e5726598d757c0449.png)
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457584016719872/2457779030130688/STEM/935cf479808c4250933161ff76fd0d92.png?resizew=119)
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【推荐1】学习过菱形性质后,数学兴趣小组活动中,小明编制了一道数学题目:如图1,菱形ABCD中,
,点M为射线AB上一个动点,将射线DM绕点D逆时针旋转
,交直线BC于点N,若
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
下面是小组的讨论,请仔细阅读并完成下述任务:
小明:我的证法是在
和
中,
,
,
,
,
.
小亮:我觉得小明的题设中
是多余的,没有这个条件也能证出
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/c50bcfc5-72cf-46e5-9163-26de2a3b1230.png?resizew=353)
(1)小明得出的依据是 (填序号).
①SSS;②SAS;③AAS;④ASA;⑤HL
(2)小亮的说法是否正确?若正确,请给出证明;若不正确,请说明理由
(3)若
,
,直接写出DN的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049ba02a6816033ade98e679a59a3b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
下面是小组的讨论,请仔细阅读并完成下述任务:
小明:我的证法是在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484d1cd79c2f3230a7bd65ae99a3edae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6155588b411c8e88398f0916a23c0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c017a7cbd4fa27b0dc4fe43a710ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b2ca779bf6b4e9919e3181fcfee2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaae277348b29d11034ab42c12ebb929.png)
小亮:我觉得小明的题设中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049ba02a6816033ade98e679a59a3b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/c50bcfc5-72cf-46e5-9163-26de2a3b1230.png?resizew=353)
(1)小明得出的依据是 (填序号).
①SSS;②SAS;③AAS;④ASA;⑤HL
(2)小亮的说法是否正确?若正确,请给出证明;若不正确,请说明理由
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fa0a286a55692e4263a5993b01580b.png)
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解答题-作图题
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【推荐2】如图,四边形
是平行四边形,点A,B,D均在圆上.请仅用无刻度的直尺分别下列要求画图.
(1)在图①中,若
是直径,
与圆相切,画出圆心O;
(2)在图②中,若
均与圆相切,画出圆心O.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/6ce9dffd-410d-456a-a461-942d90d073b1.jpg?resizew=335)
(1)在图①中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在图②中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae076e151c24084f1ca2ca502dede95.png)
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解答题-问答题
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【推荐1】如图,点
为矩形
的对称中心,
,
,点
,
,
分别从
,
,
三点同时出发,沿矩形的边按逆时针方向匀速运动,点
的运动速度为
,点
的运动速度为
,点
的运动速度为
.当点
到达点
(即点
与点
重合)时,三个点随之停止运动.在运动过程中,
关于直线
的对称图形是
,设点
,
,
运动的时间为
(单位:
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/a39fffc4-f867-4b9c-adbc-4ee3e490eebc.png?resizew=372)
(1)当
s时,四边形
为正方形.
(2)当
为何值时,以点
,
,
为顶点的三角形与以点
,
,
为顶点的三角形可能全等?
(3)是否存在实数
,使得点
与点
重合?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226415dd4aa8e3716143fc0647f8e351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafbaba785f4397c1ebd59e3c65546fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653a4c5c57dd83fdbcc7dfdd24df742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c5729b66f951db6967066763c05002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/a39fffc4-f867-4b9c-adbc-4ee3e490eebc.png?resizew=372)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7256ed023562c525e78697aea7b83a4.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-证明题
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较难
(0.4)
【推荐2】【教材呈现】如图是华师版八年级下册数学教材第121页的部分内容.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/39acfd30-0329-4d6a-af0a-91ade17c73d8.png?resizew=558)
(1)【问题解决】如图①,已知矩形纸片
,将矩形纸片沿过点D的直线折叠,使点A的对应点
落在边DC上,折痕为DE,点E在边AB上.求证:四边形
是正方形.
(2)【规律探索】由【问题解决】可知,图①中的
为等腰三角形.若将矩形纸片沿PF折叠,如图②,使点A的对应点为点Q(点Q在点C的左侧),点F在边DC上,点P在边AB上,那么
还是等腰三角形吗?请说明理由.
(3)【结论应用】在图②中,当
时,将矩形纸片继续折叠如图③,使点C与点P重合,折痕为QG,点G在边AB上.若
,
,则
的周长为______,四边形PGQF的面积为______.
把一张矩形纸片如图那样折一下,就可以裁出正方形纸片,为什么?![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/39acfd30-0329-4d6a-af0a-91ade17c73d8.png?resizew=558)
(1)【问题解决】如图①,已知矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83c15e14023ca74a365b685f363a87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0054610b07c11f3cb88aa87b58c2df11.png)
(2)【规律探索】由【问题解决】可知,图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dbf33492e5223df78dea34a24ae015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adccd1dd14171c8c29d4a3836728c0f.png)
(3)【结论应用】在图②中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5ce139702cc0eaf15022712510c394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee17b910f60fa3a0f6387f5fa67053e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e61df9f98fc1be430c5c81ba4d4382.png)
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【推荐1】有一张矩形纸片ABCD,其中AB=10,AD=6,现将矩形纸片折叠,点D的对应点记为点P,折痕为EF(点E、F是折痕与矩形纸片的边的交点),再将纸片还原.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/d315b433-4bbf-40a9-be97-89136dbcdb2b.png?resizew=314)
(1)若点P落在矩形ABCD的边AB上(如图①).
①当点P与点A重合时,∠DEF=________°,当点E与点A重合时,∠DEF=________°,当点F与点C重合时,AP=________;
②若点P为AB的中点,求AE的长;
(2)若点P落在矩形ABCD的外部(如图②),点F与点C重合,点E在AD上,BA与FP交于点M,当AM=DE时,请求出AE的长;
(3)若点E为动点,点F为DC的中点,直接写出AP的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/d315b433-4bbf-40a9-be97-89136dbcdb2b.png?resizew=314)
(1)若点P落在矩形ABCD的边AB上(如图①).
①当点P与点A重合时,∠DEF=________°,当点E与点A重合时,∠DEF=________°,当点F与点C重合时,AP=________;
②若点P为AB的中点,求AE的长;
(2)若点P落在矩形ABCD的外部(如图②),点F与点C重合,点E在AD上,BA与FP交于点M,当AM=DE时,请求出AE的长;
(3)若点E为动点,点F为DC的中点,直接写出AP的最小值.
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名校
【推荐2】综合与实践
综合与实践课上,老师让同学们以“矩形的折叠”为主题开展数学活动.
操作一:对折矩形纸片
,使
与
重合,得到折痕
,把纸片展平;
操作二:在
上选一点
,沿
折叠,使点
落在矩形内部点
处,把纸片展平,连接
,
.
根据以上操作,当点
在
上时,写出图1中一个
的角:______.
(2)迁移探究
小华将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片ABCD按照(1)中的方式操作,并延长
交
于点Q,连接
.
①如图2,当点
在
上时,
______°,
______°;
②改变点
在
上的位置(点
不与点
,
重合),如图3,判断
与
的数量关系,并说明理由.
(3)拓展应用
在(2)的探究中,已知正方形纸片
的边长为
,当
时,直接写出
的长.
综合与实践课上,老师让同学们以“矩形的折叠”为主题开展数学活动.
操作一:对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
根据以上操作,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
(2)迁移探究
小华将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片ABCD按照(1)中的方式操作,并延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
①如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393df23fdf498b987f6338fedf0bc0cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee94cdf8775ac215ee354d9c8e1fa2ad.png)
②改变点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cd4848ce65d25d3bb30a725322ca8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33149bfd164e70c6743fa0c97e9a897f.png)
(3)拓展应用
在(2)的探究中,已知正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19daa2b38e3a52bd7096d235c843110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18d012a26bb4f9283a64b02d9ee110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次