数学活动课上,老师让同学们根据下面情境提出问题并解答.问题情境:在平行四边形
中,点P是边
上一点,将
沿直线
折叠,点D的对应点为E.
数学思考:
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214840831221760/3215397512626176/STEM/bdb68c8794234ab0ab59578238d62f52.png?resizew=476)
(1)“兴趣小组”提出的问题是:如图1,若点P与点A重合,过点E作
,与
交于点F,连接
,则四边形
是菱形.请你证明“兴趣小组”提出的问题;
拓展探究:
(2)“智慧小组”提出的问题是:如图2,当点P为
的中点时,延长
交
于点F,连接
.试判断
与
的位置关系,并说明理由;
问题解决:
(3)“创新小组”在前两个小组的启发下,提出的问题是:如图3,当点E恰好落在
边上时,
,求
的长.
![](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/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
数学思考:
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214840831221760/3215397512626176/STEM/bdb68c8794234ab0ab59578238d62f52.png?resizew=476)
(1)“兴趣小组”提出的问题是:如图1,若点P与点A重合,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfffc4b756bd8b93304efc27c3d7b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
拓展探究:
(2)“智慧小组”提出的问题是:如图2,当点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
问题解决:
(3)“创新小组”在前两个小组的启发下,提出的问题是:如图3,当点E恰好落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ad41e1b0e30227aca204054dbc5fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2023-04-13 06:45:53
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解答题-作图题
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【推荐1】如图,在平面直角坐标系中,已知△ABC的三个顶点的坐标分别为A(﹣5,1),B(﹣2,2),C(﹣1,4).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/ac5f241c-3c49-4695-a203-f5e129c4daeb.png?resizew=305)
(1)△A1B1C1与△ABC关于原点O成中心对称,画出△A1B1C1;
(2)△ABC的面积为______;
(3)若D点在第一象限,且以A、B、C、D为顶点的四边形是平行四边形,则D点的坐标为_______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/ac5f241c-3c49-4695-a203-f5e129c4daeb.png?resizew=305)
(1)△A1B1C1与△ABC关于原点O成中心对称,画出△A1B1C1;
(2)△ABC的面积为______;
(3)若D点在第一象限,且以A、B、C、D为顶点的四边形是平行四边形,则D点的坐标为_______.
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【推荐2】如图,在平行四边形
中,
,
,
.动点P从点A出发沿
以
速度向终点D运动,同时点Q从点C出发,以
速度沿射线
运动,当点P到达终点时,点Q也随之停止运动,设点P的运动时间为t秒(
).
的长为 ;
(2)线段
的长为 ;(用含t的代数式表示)
(3)当以P、Q、A、B为顶点的四边形为平行四边形时,求出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f600a77e7b9c0ad939102d2ec0de3961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cddb1810546c5c7f06846bc968590cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(3)当以P、Q、A、B为顶点的四边形为平行四边形时,求出t的值.
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解答题-证明题
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真题
【推荐1】如图,AB是⊙O的直径,点C、D为半圆O的三等分点,过点C作CE⊥AD,交AD的延长线于点E.
(1)求证:CE为⊙O的切线;
(2)判断四边形AOCD的形状,并说明理由.
(1)求证:CE为⊙O的切线;
(2)判断四边形AOCD的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/2d6b3567-2856-40ff-8595-a568d94278b5.png?resizew=169)
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【推荐2】如图,已知
内接于
,且
,直径
交
于点E,F是
上的一点,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/ca7f8ff7-b3b8-459c-af58-2710944c39ee.png?resizew=173)
(1)求证:
;
(2)试判断四边形
的形状,并说明理由;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5c19b2639f5d0670b38b1833157275.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/ca7f8ff7-b3b8-459c-af58-2710944c39ee.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa99d910d38ee16c827322aae96b2814.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d3f0a9d135939f2d115836a4079c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】综合与实践
【问题情景】如右图,在
中,
,
,F是
边上一动点,将
沿着
翻折得点A的对应点D,连接
,将射线
绕点C顺时针旋转
交
于点E.
【问题发现】(1)如图1,若
,设
.
①求
的度数.(用含
的式子表示)
②求证:
.
【拓展应用】(2)如图2,若
,
,在点F移动的过程中,当
为直角三角形时,请直接写出
的长.
【问题情景】如右图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29d99411ddf034bcd1e819b56d19a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4139b091e9dc432b267ff68420c77de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
【问题发现】(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dd3ddb7bbf69309d4647c3cdbfb8b1.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/3d3dea24-023e-47ab-90c4-000c945cea90.png?resizew=242)
【拓展应用】(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9173b446b8ff3ec5506540f277d93a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/0e5bbec7-3839-41ee-a5ee-2739c74b8da6.png?resizew=717)
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解答题-证明题
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【推荐2】如图,将长方形纸片
折叠,使点D与点B重合,点C落在点
处,折痕为
.
.
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd12b017098861980aee1ae6cb5c973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
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解答题-证明题
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【推荐1】如图,
在
上,
、
相交于点
,且
,
![](https://img.xkw.com/dksih/QBM/2018/9/30/2043602043969536/2046389678022656/STEM/54e7c32460d54c899973b2e48c05709b.png?resizew=144)
图中有哪几对位似三角形,选其中一对加以证明;
若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551cb5934982e9678e233298025f0f57.png)
![](https://img.xkw.com/dksih/QBM/2018/9/30/2043602043969536/2046389678022656/STEM/54e7c32460d54c899973b2e48c05709b.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9723635d46664a92d3af26362dfea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
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解答题-证明题
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【推荐2】已知: 在
中,
,且点 E、F 分别在矩形
的边
上.
上时, ①求证:
;②当
, E是
的中点时, 求
的长;
(2)如图2, 若F 是
的中点,
与
相交于点 N, 连接
, 求证:
;
(3)如图3, 若
分别交
于点 M、N, 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0e17e4c9e0a84fd9e88db6e9f9e69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce8ebe684ab4fd905deddd160462847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637036d26c56bacaa700595eca3f37a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35463079aeec0c9489fe0c2f4b6fb26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(2)如图2, 若F 是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fda5d3bec762fcbc9f450be383b05c.png)
(3)如图3, 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476686143cacf16ba66a2348475d8e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d466a5f14926a5b2c2a9fd97eba893d8.png)
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