综合与实践
【问题情境】数学活动课上,老师准备了若干张正方形纸片
,组织同学们进行折纸探究活动.
【初步尝试】把正方形对折,折痕为
,然后展开,沿过点A与点E所在的直线折叠,点B落在点
处,连接
,如图1,请直接写出
与
的数量关系.
【能力提升】把正方形对折,折痕为
,然后展开,沿过点A与
上的点G所在的直线折叠,使点B落在
上的点P处,连接
,如图2,猜想
的度数,并说明理由.
【拓展延伸】在图2的条件下,作点A关于直线
的对称点
,连接
,
,
,如图3,求
的度数.
【问题情境】数学活动课上,老师准备了若干张正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【初步尝试】把正方形对折,折痕为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1415cbc783d768eed4ac332fffec8811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34454fb15dacb7a13c964600cb8c5efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b36d69c34251d08137a9277d86ef74.png)
【能力提升】把正方形对折,折痕为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
【拓展延伸】在图2的条件下,作点A关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3f7368811340328acf5be13f499d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2dc9c2945d9069a34485746931efc2.png)
更新时间:2024-01-22 21:25:57
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相似题推荐
解答题-问答题
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解题方法
【推荐1】在平面直角坐标系中,O为原点,边长为2的正方形OABC的两顶点A、C分别在y轴、x轴的正半轴上,现将正方形OABC绕点O顺时针旋转.
(1)如图①,当点A的对应的A′落在直线y=x上时,点A′的对应坐标为________;点B的对应点B′的坐标为_________;
(2)旋转过程中,AB边交直线y=x于点M,BC边交x轴于点N,当A点第一次落在直线y=x上时,停止旋转.
①如图2,在正方形OABC旋转过程中,线段AM,MN,NC三者满足什么样的数量关系?请说明理由;
②当AC∥MN时,求△MBN内切圆的半径(直接写出结果即可)
(1)如图①,当点A的对应的A′落在直线y=x上时,点A′的对应坐标为________;点B的对应点B′的坐标为_________;
(2)旋转过程中,AB边交直线y=x于点M,BC边交x轴于点N,当A点第一次落在直线y=x上时,停止旋转.
①如图2,在正方形OABC旋转过程中,线段AM,MN,NC三者满足什么样的数量关系?请说明理由;
②当AC∥MN时,求△MBN内切圆的半径(直接写出结果即可)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/ed024280-fd9e-420c-b756-a3d996fc38ae.png?resizew=342)
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【推荐2】已知∠MON=90°,线段AB长为6cm,AB两端分别在OM、ON上滑动,以AB为边作正方形ABCD,对角线AC、BD相交于点P,连结OC.
(1)求证:无论点A、点B怎样运动,点P都在∠AOB的平分线上;
(2)若OP=4
,求OA的长.
(3)求OC的最大值(提示:取AB的中点Q,连接CQ、OQ,运用两点之间,线段最短)
(1)求证:无论点A、点B怎样运动,点P都在∠AOB的平分线上;
(2)若OP=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)求OC的最大值(提示:取AB的中点Q,连接CQ、OQ,运用两点之间,线段最短)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/b09f9ca2-4445-476d-8cbc-25eb846cc005.png?resizew=173)
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【推荐1】如图,在
中,
,点
为边
上一点,
,且
,点
关于直线
的对称点为
,连接
,又
的
边上的高为
.
(1)判断直线
是否平行?并说明理由;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cacb947622647cbd8e85116043e290d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319b1b275befb2dfc896574ab9d8b51b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37735b198b936cf9110234f097f8963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484c9b9e3e1a07eeddd92a14ee0479a9.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8ec82767aef5023ed188f7cca983a9.png)
![](https://img.xkw.com/dksih/QBM/2018/1/28/1870237794451456/1873058565021696/STEM/0791383a1a18416186a0de8f94214a2e.png?resizew=166)
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【推荐2】已知在菱形 ABCD 中,∠ABC=60°,M、N 分别是边 BC,CD 上的两个动点,∠MAN=60°,AM、AN 分别交 BD 于 E、F 两点.
![](https://img.xkw.com/dksih/QBM/2020/4/2/2432811271536640/2433787962327040/STEM/a4a58d9066c14c89b5a955cf04d79b3f.png?resizew=368)
(1)如图 1,求证:CM+CN=BC;
(2)如图 2,过点 E 作 EG∥AN 交 DC 延长线于点 G,求证:EG=EA;
(3)如图 3,若 AB=1,∠AED=45°,直接写出 EF 的长.
(4)如图 3,若 AB=1,直接写出
BE+AE的最小值
![](https://img.xkw.com/dksih/QBM/2020/4/2/2432811271536640/2433787962327040/STEM/a4a58d9066c14c89b5a955cf04d79b3f.png?resizew=368)
(1)如图 1,求证:CM+CN=BC;
(2)如图 2,过点 E 作 EG∥AN 交 DC 延长线于点 G,求证:EG=EA;
(3)如图 3,若 AB=1,∠AED=45°,直接写出 EF 的长.
(4)如图 3,若 AB=1,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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【推荐1】点P在四边形
的对角线
上,直角三角板
的直角边
,
分别交
,
边于点M,N.
对角线
,
的交点,当点Р在点O处时,无论三角板
绕点O怎样转动,我们发现,三角板与正方形重叠部分的面积总等于______;
【类比探究】(2)如图2,在(1)的条件下,改变点Р的位置(P在对角线AC上),若
,则有
.
下面是该结论的证明过程:
证明:过点P作
于点G,作
于点H,
……
请按以上证明思路完成剩余的证明过程;
【迁移探究】(3)如图3,在(2)的条件下,将“正方形
”改为“矩形
”,且
,
,其他条件不变.若
,且
过点B,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
【类比探究】(2)如图2,在(1)的条件下,改变点Р的位置(P在对角线AC上),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52f125abf9625888d5feb7d6d2b5fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf295b3a70996eb918ae1a823e1747c.png)
下面是该结论的证明过程:
证明:过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d7566369c178316219bb466a66d062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef7eab528a8dd3e3f328de3b3ac80ee.png)
……
请按以上证明思路完成剩余的证明过程;
【迁移探究】(3)如图3,在(2)的条件下,将“正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d71107894329b293117036013dcbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
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【推荐2】【探索发现】
“旋转”是一种重要的图形变换,图形旋转过程中蕴含着众多数学规律,以图形旋转为依托构建的解题方法是解决几何问题的常用方法.如图1,在正方形
中,点
在
上,点
在
上,
.
某同学进行如下探索:
第一步:将
绕点
顺时针旋转90°,得到
,且
、
、
三点共线;
第二步:证明
≌
;
第三步:得到
和
的大小关系,以及
、
、
之间的数量关系.
请完成第二步的证明,并写出第三步的结论.
【问题解决】
如图2,在正方形
中,点
在
上,且不与
、
重合,将
绕点
顺时针旋转,旋转角度小于90°,得到
,当
、
、
三点共线时,这三点所在直线与
交于点
,要求使用无刻度的直尺与圆规找到
点位置,某同学做法如下:连接
,与
交于点
,以
为圆心,
为半径画圆弧,与
相交于一点,该点即为所求的点
.
请证明该同学的做法.(前面【探索发现】中的结论可直接使用,无需再次证明)
【拓展运用】
如图3,在边长为2的正方形
中,点
在
上,
与
交于点
,过点
作
的垂线,交
于点
,交
于点
,设
(
),
,直接写出
关于
的函数表达式:_______________.
“旋转”是一种重要的图形变换,图形旋转过程中蕴含着众多数学规律,以图形旋转为依托构建的解题方法是解决几何问题的常用方法.如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83910639ac9ea98d4980fd0820178d7.png)
某同学进行如下探索:
第一步:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d178d1a6ab4178996033cf1ca0c244.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)
第二步:证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19697acb629aed98c7733bcffd56fd0d.png)
第三步:得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9ca5dba780317ac0aa0b8878209ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
请完成第二步的证明,并写出第三步的结论.
【问题解决】
如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72877c13ed193e20096b533378d9c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
请证明该同学的做法.(前面【探索发现】中的结论可直接使用,无需再次证明)
【拓展运用】
如图3,在边长为2的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cae598854b1d6fa4c7497b8b3308f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211ebd58d457c6e7855cef475a91f203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7345fa725bf0e1b7d1fa443d8d1b115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/69460c9d-38a1-4eef-a984-c5f87a4d0aaf.png?resizew=657)
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解题方法
【推荐1】已知:在平面直角坐标系中,直线y=
x+4与x轴交于点A,与y轴交于点B,点C是x轴正半轴上一点,AB=AC,连接BC.
(1)如图1,求直线BC解析式;
(2)如图2,点P、Q分别是线段AB、BC上的点,且AP=BQ,连接PQ.若点Q的横坐标为t,△BPQ的面积为S,求S关于t的函数关系式,并写出自变量取值范围;
(3)如图3,在(2)的条件下,点E是线段OA上一点,连接BE,将△ABE沿BE翻折,使翻折后的点A落在y轴上的点H处,点F在y轴上点H上方EH=FH,连接EF并延长交BC于点G,若BG=
AP,连接PE,连接PG交BE于点T,求BT长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(1)如图1,求直线BC解析式;
(2)如图2,点P、Q分别是线段AB、BC上的点,且AP=BQ,连接PQ.若点Q的横坐标为t,△BPQ的面积为S,求S关于t的函数关系式,并写出自变量取值范围;
(3)如图3,在(2)的条件下,点E是线段OA上一点,连接BE,将△ABE沿BE翻折,使翻折后的点A落在y轴上的点H处,点F在y轴上点H上方EH=FH,连接EF并延长交BC于点G,若BG=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114bb87fca13fa9605111db0e1108565.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/42917c5d-e508-462e-a196-0151ee76a524.png?resizew=577)
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名校
解题方法
【推荐2】如图1,在
中,
,边
,点
分别在线段
上,将
沿直线
翻折,点C的对应点是点
;
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782320049340416/2782387471147008/STEM/ae5c78f6-1471-4ec6-950f-1bdcbca625bd.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782320049340416/2782387471147008/STEM/b17c9453-5a57-4c80-9083-72c0c977afd3.png)
(1)当
分别是边
的中点时,求出
的长度;
(2)若
,点
到线段
的最短距离是________;
(3)如图2,当点
在落在边
上时,
①点
运动的路程长度是______;
②当
时,求出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cda0cfe113304d510337d7764cdced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782320049340416/2782387471147008/STEM/ae5c78f6-1471-4ec6-950f-1bdcbca625bd.png)
![](https://img.xkw.com/dksih/QBM/2021/8/9/2782320049340416/2782387471147008/STEM/b17c9453-5a57-4c80-9083-72c0c977afd3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e1e4a9162e4a3740f60a131af76c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfb6fe8f50df33972ec77171fbdf159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
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较难
(0.4)
【推荐3】综合与实践
问题情境:
数学课上,同学们以“长方形纸带的折叠”为主题开展数学活动,已知长方形纸带的边
,将纸片沿折痕
折叠,点
,
分别为点
,
,线段
与
交于点
(说明:折叠后纸带的边
始终成立)
(1)如图
,若
,则
的度数为______°.
(2)如图
,改变折痕
的位置,其余条件不变,小彬发现图中
始终成立,请说明理由;
(3)改变折痕
的位置,使点
恰好落在线段
上,然后继续沿折痕
折叠纸带,点
,
分别在线段
和
上.
①如图
,点
的对应点与点
重合,点
的对应点为点
若
,直接写出
的度数.
②如图
,点
,
的对应点分别为点
,
,点
,
均在
上方,若
,
,当
时,直接写出
与
之间的数量关系.
问题情境:
数学课上,同学们以“长方形纸带的折叠”为主题开展数学活动,已知长方形纸带的边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b564c923bdec474b6779a1f8482f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ac718058dcc8a781c31bc4326ec13a.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275bfd25389e97b362cbce3164b1af2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
(3)改变折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab41cce6eb2d3058a644314865d16548.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e3d9c43a77d410bc38d67487833d815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73408b4598d1398895c81c2fc8b9f83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cd0f2bd50225f29638d67ae4b447c3.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ebc6af0864144e586126cf0e547f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f65c05b6993afce15eebf7de369c265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c80b8759f292776bbaa4e7808a32a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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