1 . 阅读下面的例题及点拨,并解决问题:
如图①,在等边
中,M是BC边上一点(不含端点B,C),N是
的外角
的平分线上一点,且
.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/ce28163f-518e-4147-8e57-3c9fcd02a4cd.png?resizew=415)
(1)点拨:如图②,作
,
与
的延长线相交于点E,得等边
,连接EM.易证:
,请完成剩余证明过程:
(2)拓展:如图③,在正方形
中,
是
边上一点(不含端点
,
),
是正方形
的外角
的平分线上一点,且
,求证:
.
(3)思维迁移:结合上面的思维探究,你对(1)中证明
、(2)中证明
是否有不同的思路,选(1)、(2)中的一个结论加以证明.
如图①,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca1951b1fe7ae822684ae2f7a877c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393d99d8768a1bdc0db594a11ad815fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/ce28163f-518e-4147-8e57-3c9fcd02a4cd.png?resizew=415)
(1)点拨:如图②,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a531df73228cfda5c1382f45fb8c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7573a570366f254e7f208ab82237dfb0.png)
(2)拓展:如图③,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca30af6bbc8607d9b9b3f3eb1a6a7dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b3244f4949cd185a8b87cc87aae671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ba6ae0d18c7aac879ec5e65525c43c.png)
(3)思维迁移:结合上面的思维探究,你对(1)中证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393d99d8768a1bdc0db594a11ad815fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ba6ae0d18c7aac879ec5e65525c43c.png)
您最近一年使用:0次
2024-01-13更新
|
193次组卷
|
2卷引用:辽宁省沈阳市沈北新区2023-2024学年九年级上学期质量监测(二)(期末)数学试题
2 . 【问题提出】
如图1,在正方形
中,点E,F分别在
边上,且
,连接
.探究线段
之间的数量关系.
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
到点G,使
,连接
,先证明
,再证明
,从而得到正确结论.小明组同学的结论是___________;
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
绕点A顺时针旋转90°得到
,再证明
,从而得到与小明组相同的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
中,
,沿边
翻折得到
,点B的对应点为点D,点E,F分别在
边上,且
.试猜想线段
之间的数量关系,并证明你的猜想.
【问题拓展】
(3)如图4,在四边形ABCD中,
,点E,F分别在
边上,且
,试猜想当
与
满足什么关系时,可使得
.请直接写出你的猜想.
(4)如图5,在四边形
中,
,
,
与
为对角线,
.若
,
,求
的长.
如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b555a0bb6b5132ecfb9cae3769912c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828d0ee008783093cbe6de3f5147bcb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【问题拓展】
(3)如图4,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99627df7b1a88b9bf3dda20390d245.png)
(4)如图5,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669f7a1e43ef893ef3a45fc47992947f.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/b2915ea6f8ea0cb67a6b135ff275b4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/7872072e-8e14-41b4-88ca-a0923e1c29d7.png?resizew=459)
您最近一年使用:0次
2024-01-10更新
|
394次组卷
|
3卷引用:辽宁省沈阳市于洪区2023-2024学年九年级上学期期末数学试题
名校
3 . 在数学活动课上,黄老师给出如下问题:在
中,
,
,点D和点B位于直线
异侧,且
.
【问题初探】
(1)当
时,求证:
.
数学活动小组同学经过讨论得出下面的解题思路并解决了这个问题.
解题思路:如图2,将线段
绕点A顺时针旋转
,得到线段
,连接
.易证
是等边三角形,易证
,将线段
之间的数量关系转化为线段
之间的数量关系.
②如图3,点D不在
的延长线上时,连接
,求证:
.
数学活动小组还有同学提出将其角度变化进行变式,请你解答.
(2)当
时,
①发现点D在
的延长线上时,点D与点C重合(不需要证明).
②如图4,点D不在
的延长线上时,连接
,判断(1)②中的结论是否仍然成立,若成立,请加以证明;若不成立,请写出正确的结论并说明理由.
黄老师在此基础上提出了下面的问题,请你解答.
(3)当
,点D不在
的延长线上时,连接
,若
,
,求
的长.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe66c48bc50c60caa62ca2c4d3068b2.png)
【问题初探】
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0348366e4137cc679165a7f18c7074db.png)
数学活动小组同学经过讨论得出下面的解题思路并解决了这个问题.
解题思路:如图2,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9509a3bb3a415f4a2d56796b0d2f418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8593a9875a1e7cf4012d7bf872b5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ce0b0e3da60c775b4235fd7c01e96d.png)
②如图3,点D不在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0348366e4137cc679165a7f18c7074db.png)
数学活动小组还有同学提出将其角度变化进行变式,请你解答.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
①发现点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②如图4,点D不在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
黄老师在此基础上提出了下面的问题,请你解答.
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93123510ac4da899e3227a0211c576e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2024-01-10更新
|
428次组卷
|
3卷引用:辽宁省抚顺市新宾满族自治县2023-2024学年九年级上学期期末数学试题
解题方法
4 . 问题初探:数学课外兴趣小组活动时,数学杨老师提出了如下问题:在
中,
,
,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法(如图1):延长
到E,使得
;再连接
,把
,
,
集中在
中;利用上述方法求出
的取值范围是
.
与
的位置关系;
感悟:数学杨老师给学生们总结解这类问题时,条件中若出现“中点”“中线”等条件,可以考虑倍长中线,或通过引平行线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
(2)类比分析:如图2,
和
都是等腰直角三角形,
,
是
的中线,试探究线段
与
的数量和位置关系,并加以证明.
(3)学以致用:如图3,已知
为直角三角形,
,D为斜边
的中点,一个三角板的直角顶点与D重合,一个直角边
与
的延长线交于点F,另一直角边与
边交于点E,若
,
,求出
的长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97392ff60fac8a261c6eab71bba028b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/817a51fea0296380e22bd9ada399a686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
感悟:数学杨老师给学生们总结解这类问题时,条件中若出现“中点”“中线”等条件,可以考虑倍长中线,或通过引平行线构造全等三角形,把分散的已知条件和所求证的结论集中到同一个三角形中.
(2)类比分析:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ae31b70c84b0c8bf215843182a8c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)学以致用:如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c39e22f3eda6e52e6461fb8b548d464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
2024-01-10更新
|
225次组卷
|
2卷引用:辽宁省抚顺市新抚区新抚区教师进修学校中学研训部2023-2024学年九年级上学期期末数学试题
5 . 【问题建立】
(1)如图1,
和
都是等边三角形,当点
在一条直线上时,把
沿直线
折叠,点
的对应点
恰好落在线段
上. 判断线段
的数量关系,并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/67c35928-813c-4fd5-a082-2faffd560a2a.png?resizew=140)
(2)如图2,在等腰直角三角形
中,
,若
于点
,且点
在直线
下方,把
沿直线
折叠,点
的对应点
恰好落在线段
上.
【问题应用】
若
,求
的长;
【问题迁移】
若
,求
的面积.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ceb5150bbb428f931c184793ed47d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69133b8aa75960a74cc963fa76c079f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/67c35928-813c-4fd5-a082-2faffd560a2a.png?resizew=140)
(2)如图2,在等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34acee9dbf27fb0fbc01507d309d8f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/d40b319212a7e7528b053e1c7097e966.png)
【问题应用】
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d8334c5df56bf7827d76d419546593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【问题迁移】
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99d15e5c5fa3eea07f96c3bc3e32af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/d7071bc2-2497-430d-9f1f-ab7ac6837f10.png?resizew=335)
您最近一年使用:0次
2024-01-10更新
|
168次组卷
|
2卷引用:2024中考辽宁省鞍山市千山区一模考前数学模拟预测题
6 . 如图所示,等腰直角
中,
.
(1)如图1所示,若D是
内一点,将线段
绕点C顺时针旋转
得到
,连接
,
,猜想线段
与
的关系并说明理由;
(2)如图2所示,若D是
外一点,将线段
绕点C顺时针旋转
得到
,且
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/64fe88c5-aa09-489e-9db2-f07da4b84317.png?resizew=284)
(1)如图1所示,若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2所示,若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e7bdd33ad2697cfb58d12fc41afdd8.png)
您最近一年使用:0次
7 . 【问题初探】
(1)如图1,在四边形
中,
,
,
,
,
,
绕
点旋转,它的两边分别交
,
于
,
.探究图中线段
,
,
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/b970d38b-1bd1-4427-9764-ebabdb0c0a4c.png?resizew=122)
小李同学探究此问题的方法是:延长
到
,使
,连接
,先证明
,再证明
,可得出结论,他的结论就是____________________;
【类比应用】
(2)如图2,在四边形
中,
,
,
,
,
绕
点旋转.它的两边分别交
,
于
,
,上述结论是否仍然成立?请直接写出结论:__________(直接写出“成立”或者“不成立”),不必说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/8fc886f8-9175-42c1-8e25-115a83f4c625.png?resizew=121)
【学以致用】
(3)如图3,在四边形
中,
,
,
,
绕
点旋转.它的两边分别交
,
于
,
.上述结论是否仍然成立?请说明理由;
(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2449b6be64417beea30528886720c20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/a0ed1ec316bc54c37c4286c208f55667.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)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/b970d38b-1bd1-4427-9764-ebabdb0c0a4c.png?resizew=122)
小李同学探究此问题的方法是:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c4f440b65c520d479378fa89c1d375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e666dd62dfcf04a01f00a073989646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5398765f449aeb313c6e32413c41b256.png)
【类比应用】
(2)如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd52c2dfe29fdc18c65e1f488f138bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/8fc886f8-9175-42c1-8e25-115a83f4c625.png?resizew=121)
【学以致用】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b648f6f2bcc33d4ab0d3925ffb9c5e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd52c2dfe29fdc18c65e1f488f138bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/c665f421-8bd9-42d5-b1fb-ea015df2d914.png?resizew=138)
您最近一年使用:0次
8 . 如图,在正方形
中,点
、
分别在
和
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/e8038cba-00fd-463c-b482-9bec0155b5f1.png?resizew=163)
(1)
与
有怎样的数量关系,并说明理由.
(2)连接
交
于点
,延长
至点
,.使
,连接
,
,判断四边形
是什么特殊的四边形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/e8038cba-00fd-463c-b482-9bec0155b5f1.png?resizew=163)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5de44310b7ae22de1884a47ec9811fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f30cb81835298cb612a828f355060a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0234cd0cb930b3179609d289c90e22cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87f0082cda6901a2d7c1f392ddc106b.png)
您最近一年使用:0次
9 . 如图,在正方形
中,点
是对角线
上的一点,连接
交
延长线于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/c2f9406e-c043-486b-8161-84c8ad71caed.png?resizew=153)
(1)求证:
;
(2)当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/c2f9406e-c043-486b-8161-84c8ad71caed.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e05719ac02fb6935f0094e38d332e10.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfacbf2a833e9c98cb6d81904e7cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8b62dc033d86ee9e561b8903796701.png)
您最近一年使用:0次
10 . 综合与实践
问题情境:
中,
,
,
于点D,点E是射线
上的一个动点(不与点A重合)将线段
绕点A顺时针旋转
得到线段
,连接
交线段
于点G.交
于点H、连接
.
特例分析:
(1)如图1,当点E与点D重合时,“智敏”小组提出如下问题,请你解答:用等式表示线段
与
之间的数量关系为:_______;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/72ab4383-8f68-4c12-8296-8e797bf8e6cc.png?resizew=157)
拓展探究:
(2)如图2,当点E在线段
的延长线上,且
时,“博睿”小组发现
.请你证明;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1d4e2e08-dcfb-4407-b7ee-4b00f5a3133b.png?resizew=156)
(3)如图3,当点E在线段
的延长线上,且
时,
的值为_______;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/265f01df-d2b0-4912-b638-85af79fedb3f.png?resizew=162)
推广应用:
(4)当点E在射线
上运动时,
,则
的值为_______(用含m,n的式子表示).
问题情境:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/31e55e398e8520d8a36fb5a625a085b8.png)
特例分析:
(1)如图1,当点E与点D重合时,“智敏”小组提出如下问题,请你解答:用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/72ab4383-8f68-4c12-8296-8e797bf8e6cc.png?resizew=157)
拓展探究:
(2)如图2,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850c12524ad7df9aa5ed4f02cd603e40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1d4e2e08-dcfb-4407-b7ee-4b00f5a3133b.png?resizew=156)
(3)如图3,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae2e8b074cb592effa45491c94d07f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/265f01df-d2b0-4912-b638-85af79fedb3f.png?resizew=162)
推广应用:
(4)当点E在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbe02327b24c37218035da7939b7360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae2e8b074cb592effa45491c94d07f4.png)
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