【特例感知】
(1)如图
,已知
和
是等边三角形,直接写出线段
与
的数量关系是______;
【类比迁移】
(2)如图
,
和
是等腰直角三角形,
,写出线段
与
的数量关系,并说明理由;
【拓展运用】
(3)如图
,若
,点
是线段
外一动点,
,连接
.若将
绕点
逆时针旋转得到
,连接
,求出
的最大值.
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【类比迁移】
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【拓展运用】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/03902478df1a55bc99703210bccab910.png)
更新时间:2024-04-15 21:02:02
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】在平面直角坐标系
中,点A,B,P不在同一条直线上.对于点P和线段
给出如下定义:过点P向线段
所在直线作垂线,若垂足Q落在线段
上,则称点P为线段
的内垂点,已知点A
,B
,C
.
(1)在点
、
、
中,线段
的内垂点为________;
(2)点N在y轴上且为线段
的内垂点,则点N的纵坐标n的取值范围是________;
(3)若垂足Q满足
最小,则称点P为线段
的最佳内垂点.点M是线段
的最佳内垂点且到线段
的距离是1,则点M的坐标为________;
(4)已知直线m与x轴交于点
,与y轴交于点
,将直线m沿y轴平移2个单位长度得到直线n,若存在点Q,使线段
的内垂点形成的区域恰好是直线m和n之间的区域(包括边界),直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f48e1c656aace41360467f254e359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d03268e486f9fb09a44eca7d8ff7a9b.png)
![](https://img.xkw.com/dksih/QBM/2023/4/25/3224394367508480/3267561114673152/STEM/b4b1fa9899334492a06290a93684fe94.png?resizew=332)
(1)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6665dc77d95a288e8b1d4e56b5bf0b7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3ee0c16c97523800dea574620a6549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4197bd6e415fe779f8ba9e8042dfec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)点N在y轴上且为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)若垂足Q满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a373262415090719ca97d2c3d4d8fe12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(4)已知直线m与x轴交于点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知:三角形ABC中,∠A=90°,AB=AC,D为BC的中点.
(1)如图,E、F分别是AB、AC上的点,且BE=AF,求证:△DEF为等腰直角三角形.
(2)若E、F分别为AB,CA延长线上的点,仍有BE=AF,其他条件不变,那么,△DEF是否仍为等腰直角三角形?画出图形,写出结论不证明.
(1)如图,E、F分别是AB、AC上的点,且BE=AF,求证:△DEF为等腰直角三角形.
(2)若E、F分别为AB,CA延长线上的点,仍有BE=AF,其他条件不变,那么,△DEF是否仍为等腰直角三角形?画出图形,写出结论不证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/92cf7d6f-2080-499b-b08d-d65a906310cd.png?resizew=165)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
真题
【推荐1】如图,
是⊙
的直径,
为⊙
上的一点,点
是
的中点,连接
,过点
的直线垂直于
的延长线于点
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/1cf7ceca-2ff1-4094-b11d-6665a2308a53.png?resizew=165)
(1)求证:
为⊙
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/1cf7ceca-2ff1-4094-b11d-6665a2308a53.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee00a3af3af96fc12b53df8fb5c4872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54bf739ada87edb51304d38f09b46d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】将一个直角三角形纸片ABO放置在平面直角坐标系中,点A(
,0),点B(0,1),点O(0,0)P是边AB上的一点(点P不与点A,B重合),沿着OP折叠该纸片,得点A的对应点A′.
![](https://img.xkw.com/dksih/QBM/2019/5/24/2210403419758592/2213420613386240/STEM/e80c7f28397a4e49b160c1c1cb31f7bc.png?resizew=396)
(1)如图①,当点A′在第一象限,且满足A′B⊥OB时求点A的坐标;
(2)如图②,当P为A′B中点时,求A′B的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/5/24/2210403419758592/2213420613386240/STEM/e80c7f28397a4e49b160c1c1cb31f7bc.png?resizew=396)
(1)如图①,当点A′在第一象限,且满足A′B⊥OB时求点A的坐标;
(2)如图②,当P为A′B中点时,求A′B的长;
您最近一年使用:0次
【推荐3】把
和
按如图①摆放
点
与
重合
,点
、
、
在同一条直线上.已知:
,
,
,
,
.如图②,
从图①的位置出发,以每秒
个单位的速度沿
向
匀速移动,在
移动的同时,点
从
的顶点
出发,以每秒
个单位的速度沿
向点
匀速移动;当点
移动到点
时,点
停止移动,
也随之停止移动.
与
交于点
,连接
,设移动时间为
.
(1)
在平移的过程中,
______(用含
的代数式表示);当点
落在
的边
上时,求
的值.
(2)在移动过程中,当
时,连接
,
①设四边形
的面积为
,求
与
之间的函数关系式,并试探究
的最大值;
②是否存在
为直角三角形?若存在,请直接写出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5d835ca247252e4903af22789b5f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.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/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b3765f9c7d97bcc19e520e9526ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66b90ffe8c9a93aba917c61007e895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618b4d41917e695da2356c016242ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08668b77628265eaa98a3cee1338dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/07c0da1c-0ac8-48b6-a0ba-52ad4d8e139c.jpg?resizew=456)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cd05d557c83954e98743b71b2f0a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)在移动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3823aeb44f6c96e65b2effc7e5569116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
①设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01f4dea8619f09fe77b95bd23cd0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5845d0b7ca6980eea65473c0de995de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,在平面直角坐标系中,二次函数
的图象经过点
.
(1)求二次函数表达式;
(2)E、F分别是抛物线上位于点A两侧的点(E在A左侧),过点E、A、F作x轴的垂线,垂足分别为
、
、
,且
、
关于点
对称.
求证:直线
与x轴的夹角大小不变;
(3)如图2,设抛物线与y轴交于点C,顶点是D,P为A点右侧抛物线上一点,过点P作y轴的平行线交直线
于点Q,交直线
于点M,过点Q作
的平行线交直线
于点N.求点N到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c918787254560e2f2241db7a7936b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39434903dca5f23a17e1a928ffbecd58.png)
(1)求二次函数表达式;
(2)E、F分别是抛物线上位于点A两侧的点(E在A左侧),过点E、A、F作x轴的垂线,垂足分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图2,设抛物线与y轴交于点C,顶点是D,P为A点右侧抛物线上一点,过点P作y轴的平行线交直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图,在△ABC 中,AD⊥BC 于 D(其中 BD>CD),BE⊥AC 于 E,AD 与 BE 相交于点 F,直线 AD 与△BCF 的外接圆 O 交于点 H,点 M 在圆 O 上,满足弧 HM=弧 CF,连接 FM.
![](https://img.xkw.com/dksih/QBM/2020/4/8/2437291759886336/2437766750568448/STEM/146615adc7e44699b898849935ccab35.png?resizew=138)
(1)求证:AF=CM;
(2)若∠ABE=45°,FH
,圆O的直径为
,求BF的值.
![](https://img.xkw.com/dksih/QBM/2020/4/8/2437291759886336/2437766750568448/STEM/146615adc7e44699b898849935ccab35.png?resizew=138)
(1)求证:AF=CM;
(2)若∠ABE=45°,FH
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6fa1e018348f08e7a6f4f1d048ca97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】综合与实践
如图1,在直角三角形纸片
中,
,
,
.
【数学活动】
将三角形纸片
进行以下操作:第一步:折叠三角形纸片
使点
与点
重合,然后展开铺平,得到折痕
;第二步:将
沿折痕
展开,然后将
绕点
逆时针方向旋转得到
,点
,
的对应点分别是点
,
,直线
与边
所在直线交于点
(点
不与点
重合),与边
所在直线交于点
.
(1)折痕
的长为______;
(2)
绕点
旋转至图1的位置时,试判断
与
的数量关系,并证明你的结论;
【数学探究】
(3)
绕点
旋转至图2、图3所示位置时,探究下列问题:
①如图2,当直线
经过点
时,
的长为______;
②如图3,当直线
时,
的长为______;
【问题延伸】
(4)在
绕点
旋转的过程中,连接
,则
的取值范围是______.
如图1,在直角三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
【数学活动】
将三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
【数学探究】
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①如图2,当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
②如图3,当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95a2a2d3ead86a287255a428997c399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
【问题延伸】
(4)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】在△ABC中,AB=AC,点P在平面内,连接AP并将线段AP绕点A顺时针方向旋转与∠BAC相等的角度,得到线段AQ,连接BQ.
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873946661535744/2876725742182400/STEM/5d5c7470-620a-4d1a-921b-df2f878f57ad.png?resizew=431)
(1)发现问题
如图1,如果点P是BC边上任意一点,则线段BQ和线段PC的数量关系是 ;
(2)类比探究
如图2,如果点P为平面内任意一点,前面发现的结论是否仍然成立?若成立,请给予证明;若不成立,请说明理由.请仅以图2所示的位置关系加以证明;
(3)迁移应用
如图3,在△ABC中,AC=2,∠ABC=90°,∠ACB=45°,P是线段BC上的任意一点.连接AP,将线段AP绕点A顺时针方向旋转45°,得到线段AQ,连接BQ,试求线段BQ长度的最小值.
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873946661535744/2876725742182400/STEM/5d5c7470-620a-4d1a-921b-df2f878f57ad.png?resizew=431)
(1)发现问题
如图1,如果点P是BC边上任意一点,则线段BQ和线段PC的数量关系是 ;
(2)类比探究
如图2,如果点P为平面内任意一点,前面发现的结论是否仍然成立?若成立,请给予证明;若不成立,请说明理由.请仅以图2所示的位置关系加以证明;
(3)迁移应用
如图3,在△ABC中,AC=2,∠ABC=90°,∠ACB=45°,P是线段BC上的任意一点.连接AP,将线段AP绕点A顺时针方向旋转45°,得到线段AQ,连接BQ,试求线段BQ长度的最小值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】在
中,
,
,点P是平面内不与点B,C重合的一动点,连接PC,将线段PC绕点P顺时针旋转
得到线段PQ,连接BQ,CQ,AP,点M,N分别是线段CB,CQ的中点,连接MN.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949674295009280/2957281538850816/STEM/647a0f460ef54bd49d695498ab5f952b.png?resizew=521)
(1)【观察猜想】如图1,当点P与点B在直线CA两侧,
时,
的值是______,直线MN与直线PA所成的锐角的度数是______;
(2)【类比探究】如图2,当点P与点B在直线CA两侧,
时,求
的值及直线MN与直线PA所成的锐角的度数;
(3)【解决问题】当点P在直线BC上方,
,且点A,P,Q在同一条直线上时,连接BP,已知
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949674295009280/2957281538850816/STEM/647a0f460ef54bd49d695498ab5f952b.png?resizew=521)
(1)【观察猜想】如图1,当点P与点B在直线CA两侧,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
(2)【类比探究】如图2,当点P与点B在直线CA两侧,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
(3)【解决问题】当点P在直线BC上方,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3462640c7bea3bc941009b164e118c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874d029eed2f2b791626e4c03277181d.png)
您最近一年使用:0次