已知,如图1,
是边长为1的正方形
的对角线,
平分
交
于点
,延长
到点
,使
,连接
,交
的延长线于点
.
(1)求证:
;
(2)求
的长;
(3)如图2,在
上取一点
,且
,若以
为
轴,
为
轴建立直角坐标系,问在直线
上是否存在点P,使得以
、
、
为顶点的三角形为等腰三角形?若存在,直接写出所有符合条件的P点坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/21204d1c00149a21f59c004f6b927237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/9878a487-edf6-4196-bc03-91f2fe9cc737.png?resizew=348)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32577dda778c0bd267c4ece7bfcacf76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9206cf234b2b7b01030fb29bf1e566b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
15-16八年级下·山东济南·期末 查看更多[14]
2015-2016学年山东省济南市历下区八年级下期末数学试卷北师大版数学九年级上册第1章特殊的平行四边形单元检测题辽宁省锦州市黑山县2019-2020学年九年级上学期期中数学试题内蒙古自治区包头市青山区2020-2021学年八年级下学期期末数学试题广东省深圳市罗湖区翠园中学初中部2021-2022学年九年级上学期开学数学试题广东佛山禅城区佛山市实验学校2020-2021学年九年级上学期10月月考数学试题广东省深圳市宝安区和平中英文实验学校2020-2021学年九年级上学期第一次月考数学试题四川省广安市邻水县2021-2022学年八年级下学期期末数学试题新疆维吾尔自治区乌鲁木齐市新市区新疆师范大学附属中学2021-2022学年八年级下学期期中数学试题湖南省永州市李达中学2021-2022学年八年级下学期期中考试数学试题陕西省宝鸡市渭滨区清姜路中学2022-2023学年八年级上学期第一次质检数学试卷 辽宁省沈阳市新民市实验中学2022-2023学年九年级上学期第一次月考数学试题江西省抚州市临川区初中学校期中联考2023-2024学年九年级上学期期中数学试题山东省菏泽市郓城县郓城第一中学2023-2024学年九年级上学期期中数学试题
更新时间:2023-10-14 11:00:07
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相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】在平面直角坐标系
中,对于点
,
,
,
,记
,
,将
称为点
,
的横纵偏差,记为
,即
.若点
在线段
上,将
的最大值称为线段
关于点
的横纵偏差,记为
.
(1)
,
,
①
的值是 ;
②点
在
轴上,若
,则点
的坐标是 .
(2)点
,
在
轴上,点
在点
的上方,
,点
的坐标为
.
①当点
的坐标为
时,求
的值;
②当线段
在
轴上运动时,直接写出
的最小值及此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a54e0b4872cabdc0b07ea9380e4de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a350eb41c3b7e4face9c3299eff9d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8e72f73db207c3040f143d837d5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24529eadaef974ec0625f8ca40682e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc001b761f852464d655b4b4ba45a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efce2534eeff2123b8a62058c5d45750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0498bd91c18ee5525fcb11878ac659c9.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/acd3f2f6bd8f2954001a2c909f63984c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d85f108c543e16aeca6f1d920191b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3f2f6bd8f2954001a2c909f63984c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044d6702bccf365a802cfe1a82dca705.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e10de2c38bc918ae9e1ce62a5c70099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f958666546017890e0c80e28a1362dfd.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3f2f6bd8f2954001a2c909f63984c.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d811a3199c82b34cf902820213cc14ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5886d4b31a8d7249d3eea076d1f40354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7926cb5edef9dc7d29453e9304fc2f.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0ed4770b3aeaf388620386582237ce.png)
②当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0ed4770b3aeaf388620386582237ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐2】在平面直角坐标系xOy中,对于任意两点
和
,我们重新定义这两点的“距离”.
①当
时,
为点
与点
的“远距离”
,即
;
当
时,
为点
与点
的“远距离”
,即
.
②点
与点
的“总距离”
为
与
的和,即
.
根据以上材料,解决下列问题:
(1)已知点
,则
______;
______.
(2)若点
在第一象限,且
.求点B的坐标.
(3)①若点
,且
,所有满足条件的点C组成了图形W,请在坐标系中画出图形W;
②已知点
,
,若在线段
上总存在点E落在①的图形W上,请直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2f42c247568ba2a6b4bc9bb698abf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6abf3f9b0ebcdc47a028c781b7edb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d108766f29e468f10347be3fc91de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5b3fa580e42ed76bb621b20347d43c.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8658d93d4685b6c79ec86d7a4602c14d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0761e63cb3a4113d50f6bf808cdc031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d108766f29e468f10347be3fc91de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5cdfaf5f76f92fb0d7e7dc7a0a4ba4.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ed4f77d0fc848c8952f1268a24e6e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6abf3f9b0ebcdc47a028c781b7edb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0761e63cb3a4113d50f6bf808cdc031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd281da7a992d08c96028da418187a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/324e02c5-ad7c-419e-bb51-5b958e797e95.png?resizew=529)
根据以上材料,解决下列问题:
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643b31966f52a03f001f2e613cd701dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48819294f486ce8f047a02eee0b451c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4964f42cc1bacaf93f1bda02c2ccd873.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c150995dd6e95046f3d487ca663ab22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecb5624ed47b02aa3a887e101b828c5.png)
(3)①若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3559ad2187d15e7a9ef391015f206627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a4b7da12ca1f224aba0a2ebb6a701f.png)
②已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612f4d59e8972084b3d0cf8c194e874f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】定义:有一组邻边相等且对角互补的四边形叫做等补四边形.
(1)阅读与理解:
如图1,四边形内接于⊙O,点A为弧BD的中点.四边形ABCD (填“是”或“不是”)等补四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/81244420-c378-4215-8251-4877169c6fc5.png?resizew=176)
(2)探究与运用:
①如图2,在等补四边形ABCD中,AB=AD,连接AC,AC是否平分∠BCD?请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/e1ba100b-0ada-4bdf-9558-04fc5d9d5195.png?resizew=176)
②如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F,若CD=10,AF=5,求DF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/334e8a87-9e6a-4e0d-8ec8-f939c736dd9e.png?resizew=188)
(3)思考与延伸:
在等补四边形ABCD中,AB=AD=3,∠BAD=120°,当对角线AC长度最大时,以AC为斜边作等腰直角三角形ACP,直接写出线段DP的长度.
(1)阅读与理解:
如图1,四边形内接于⊙O,点A为弧BD的中点.四边形ABCD (填“是”或“不是”)等补四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/81244420-c378-4215-8251-4877169c6fc5.png?resizew=176)
(2)探究与运用:
①如图2,在等补四边形ABCD中,AB=AD,连接AC,AC是否平分∠BCD?请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/e1ba100b-0ada-4bdf-9558-04fc5d9d5195.png?resizew=176)
②如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F,若CD=10,AF=5,求DF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/334e8a87-9e6a-4e0d-8ec8-f939c736dd9e.png?resizew=188)
(3)思考与延伸:
在等补四边形ABCD中,AB=AD=3,∠BAD=120°,当对角线AC长度最大时,以AC为斜边作等腰直角三角形ACP,直接写出线段DP的长度.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】在
中,
,点
在
边上,
,点
在
边上,连接
,满足
,连接
,过点
作
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/6a55247c-880a-4e09-99e2-5e60cd997b4a.png?resizew=617)
(1)如图1,已知
,
,且
,求线段
的长;
(2)如图2,已知
,求证:
;
(3)如图3,若
,
,折叠
,使
恰好与
重合,折痕与
交于点G,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65db75e62be640260e8532ed13db9282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/6a55247c-880a-4e09-99e2-5e60cd997b4a.png?resizew=617)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d623a68e1575896ff7d6e4d428256037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d34211b00cadcc25a766140f980b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0857482c3fddb3bc62b0ee04a9b48973.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/daa3399101db40f8a272563553249a5f.png)
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【推荐1】如图,在四边形 ABCD 中,AB=2,∠A=∠C=60°. DB⊥AB 于点 B,∠DBC=45°,求 BC 的长.
![](https://img.xkw.com/dksih/QBM/2020/4/1/2432059300732928/2432191045279744/STEM/f190aabe6ffc440ab04d162bca06679c.png?resizew=121)
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【推荐2】折纸是我国传统的民间艺术,通过折纸可以得到许多美丽的图形,折纸的过程还蕴含着丰富的数学知识,在综合与实践课上,老师让同学们以“正方形的折叠”为主题开展了数学活动.已知在正方形纸片
中,
是
边上的点(不与点
重合),正方形
的边长为9.
【操作发现】
(1)如图1,
是边
上一点,
是边
上一点.以直线
为对称轴把正方形折叠,
的对应线段为
,其中点
在边
上,
交边
于点
,连接
,则线段
与
的关系为 ;
【实践探究】
(2)如图1,当
时,求折痕
的长;
(3)如图2,连接
,交
于点
,连接
,则
与
的数量关系是 .
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/90735073-8fd0-4522-bcf8-b02e17a02738.png?resizew=348)
【操作发现】
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
【实践探究】
(2)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973144e8ed5a1f83c7408238efae30f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaebc9408ba1baf77c436b68a0dacce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
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【推荐1】如图,正方形
中,点P在边
上(不与端点B,C重合),点B关于直线
的对称点为点E,
,则
_________°;
(2)如图2,若
,点P是
的中点,连接
,求
的长;
(3)如图3,过点D作
,交直线
于点F,连接
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9677deecea626aa6e4078f0b532ba68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f081681d2b7d0dcc7d364298800239d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5252a2f902ac1556a4db315f760cb103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9257811410728228b2f6fcecd87e73.png)
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真题
【推荐2】若正方形有两个相邻顶点在三角形的同一条边上,其余两个顶点分别在三角形的另两条边上,则正方形称为三角形该边上的内接正方形,△ABC中,设BC=a,AC=b,AB=c,各边上的高分别记为
,
,
,各边上的内接正方形的边长分别记为
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/10/13/1574246896787456/1574246900645888/STEM/f6abfc03252846709476aba4e0ad00b1.png?resizew=152)
(1)模拟探究:如图,正方形EFGH为△ABC的BC边上的内接正方形,求证:
;
(2)特殊应用:若∠BAC=90°,
=
=2,求
的值;
(3)拓展延伸:若△ABC为锐角三角形,b<c,请判断
与
的大小,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5efe57aca2f76116c2f62fb6f224be26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ffb82aa1614cd1bc28940b1a7252fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a13393b5c809072cc7c6e4adc5f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b45804af30183b9f7456223dc497cc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
![](https://img.xkw.com/dksih/QBM/2016/10/13/1574246896787456/1574246900645888/STEM/f6abfc03252846709476aba4e0ad00b1.png?resizew=152)
(1)模拟探究:如图,正方形EFGH为△ABC的BC边上的内接正方形,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d12ec2372d2e709c9c3a439b1eb8f9b.png)
(2)特殊应用:若∠BAC=90°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5336bc8649d12e131786a5bcd26341f4.png)
(3)拓展延伸:若△ABC为锐角三角形,b<c,请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
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