名校
1 . 如图1,△ACB和△DCE均为等边三角形,点A. D. E在同一直线上,连接BE.
![](https://img.xkw.com/dksih/QBM/2019/9/26/2298862299537408/2301047676035072/STEM/9343698bf378427aa4c39ebfaf5a5be4.png?resizew=384)
填空:(1),①∠AEB的度数为 ;②线段AD、BE之间的数量关系是 ;
(2)拓展探究:如图2,△ACB和△DCE均为等腰直角三角形,∠ACB=∠DCE=90°,点A、D、E在同一直线上,且交BC于点F,连接BE.若∠CAF=∠BAF,BE=2,试求AF的长.
![](https://img.xkw.com/dksih/QBM/2019/9/26/2298862299537408/2301047676035072/STEM/9343698bf378427aa4c39ebfaf5a5be4.png?resizew=384)
填空:(1),①∠AEB的度数为 ;②线段AD、BE之间的数量关系是 ;
(2)拓展探究:如图2,△ACB和△DCE均为等腰直角三角形,∠ACB=∠DCE=90°,点A、D、E在同一直线上,且交BC于点F,连接BE.若∠CAF=∠BAF,BE=2,试求AF的长.
您最近一年使用:0次
2 . 如图 1,在 Rt△ABC 中,∠A=90°,AB=AC,点 D、E 分别在边 AB、AC 上,AD=AE,连接DC,点 M、P、N 分别为 DE、DC、BC 的中点,
(1)观察猜想:如图 1 中,△PMN 是 三角形;
(2)探究证明:把△ADE 绕点 A 逆时针方向旋转到图 2 的位置,连接 MN,BD, CE.判断△PMN 的形状,并说明理由;
(3)拓展延伸:将△ADE 绕点 A 在平面内自由旋转,若 AD=4,AB=10,请求△PMN 面积的取值范围.
(1)观察猜想:如图 1 中,△PMN 是 三角形;
(2)探究证明:把△ADE 绕点 A 逆时针方向旋转到图 2 的位置,连接 MN,BD, CE.判断△PMN 的形状,并说明理由;
(3)拓展延伸:将△ADE 绕点 A 在平面内自由旋转,若 AD=4,AB=10,请求△PMN 面积的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/a94c4df6-6dee-4b1c-983c-52dcc23917d3.png?resizew=435)
您最近一年使用:0次
2018-12-15更新
|
441次组卷
|
3卷引用:【校级联考】江西省赣州市宁都县2019届九年级上学期期中考试数学试题
3 . 完成下列各题:
(1)问题情境 如图1,
和
都是等边三角形,连接
,
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/f4043d75-1a5d-47c9-891b-b5bbcee12ea5.png?resizew=145)
(2)迁移应用 如图2,
和
都是等边三角形,A,B,E三点在同一条直线上,M是
的中点,N是
的中点,P在
上,
是等边三角形,求证:P是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/8535cc3c-bb7b-419b-bda7-482e5f3e0652.png?resizew=202)
(3)拓展创新 如图3,P是线段
的中点,
,在
的下方作等边
(P,F,H三点按逆时针顺序排列,
的大小和位置可以变化),连接
,
.当EF+BH的值最小时,直接写出等边
边长的最小值.
(1)问题情境 如图1,
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/f4043d75-1a5d-47c9-891b-b5bbcee12ea5.png?resizew=145)
(2)迁移应用 如图2,
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/8535cc3c-bb7b-419b-bda7-482e5f3e0652.png?resizew=202)
(3)拓展创新 如图3,P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2816811954311a2792b3bfaa7aecf81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21871e06601d895874b1b8a49b1b808f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21871e06601d895874b1b8a49b1b808f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21871e06601d895874b1b8a49b1b808f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/5b78f6c6-7ab4-44d6-8029-c5f534383398.png?resizew=175)
您最近一年使用:0次
解题方法
4 . 定义:我们把对角线长度相等的四边形叫做等线四边形.
(1)尝试:如图1,在
的正方形网格图形中,已知点
、点
是两个格点,请你作出一个等线四边形,要求
、
是其中两个顶点,且另外两个顶点也是格点;
(温馨提示:请画在答题卷相对应的图上)
(2)推理:如图2,已知
与
均为等腰直角三角形,
,连结
,
,求证:四边形
是等线四边形;
(3)拓展:如图3,已知四边形
是等线四边形,对角线
,
交于点
,若
,
,
,
.求
的长.
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/663cc4e1-f12b-41df-b5cc-2e49e12908b3.png)
(1)尝试:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(温馨提示:请画在答题卷相对应的图上)
(2)推理:如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f5f078c32f5caf439bac951d450fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4962343ca7d065aee473dbf79eb8d3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d576adc579a512b4537a7568d125cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)拓展:如图3,已知四边形
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c3b184adb06f96bacedc27c6b21b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba56b41fe702d9b6433e4d01e48d69a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/663cc4e1-f12b-41df-b5cc-2e49e12908b3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751906117451776/2766079039758336/STEM/d46426a7-c3c4-4a27-bc1a-7eda22808038.png)
您最近一年使用:0次
5 . 【方法回顾】
课本研究三角形中位线性质的方法
已知:如图①, 已知
中,
,
分别是
,
两边中点.
求证:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
证明:延长
至点
,使
, 连按
.可证:
( )
由此得到四边形
为平行四边形, 进而得到求证结论
(1)请根据以上证明过程,解答下列两个问题:
①在图①中作出证明中所描述的辅助线(请用
铅笔作辅助线);
②在证明的括号中填写理由(请在
,
,
,
中选择) .
【问题拓展】
(2)如图②,在等边
中, 点
是射线
上一动点(点
在点
的右侧),把线段
绕点
逆时针旋转
得到线段
,点
是线段
的中点,连接
、
.
①请你判断线段
与
的数量关系,并给出证明;
②若
,求线段
长度的最小值.
课本研究三角形中位线性质的方法
已知:如图①, 已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/60ef95894ceebaf236170e8832dcf7e3.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2c025619a4584210c89166a8165a09.png)
由此得到四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10af0a2e32fb3f3af9664617ac05b669.png)
(1)请根据以上证明过程,解答下列两个问题:
①在图①中作出证明中所描述的辅助线(请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772562a411cb35b12e8a5878ddaa9de1.png)
②在证明的括号中填写理由(请在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec76570a0ddc83c103a4b77589d80701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9970629e91021aa64fb871c83746418c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbfd199e0ba3e1ec7016a44454e7a3c.png)
【问题拓展】
(2)如图②,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/8455657dde27aabe6adb7b188e031c11.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①请你判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498857080168448/2500066653528064/STEM/b5c8695d4b9e4cabb2d4f9887df362c6.png?resizew=440)
您最近一年使用:0次
解题方法
6 . 阅读理解:
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/a03096cb-e984-443f-a67b-a53ebfa9f999.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/8c977a91-8a05-40fc-9b0a-7d080de79c39.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/612e60a7-b92b-47d0-88fa-4473b773cca8.png?resizew=164)
(1)如图1,在
中,若
,
,求
边上的中线
的取值范围.解决此问题可以用如下方法:延长
到点
,使得
,再连接
,把
,
,
集中在
中,利用三角形三边关系即可判断中线
的取值范围是______.
(2)解决问题:如图2,在
中,
是
边上的中点,
,
交
于点
,
交
于点
,连接
,求证:
.
(3)问题拓展:如图3,在
中,
是
边上的中点,延长
至
,使得
,求证:
.
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/a03096cb-e984-443f-a67b-a53ebfa9f999.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/8c977a91-8a05-40fc-9b0a-7d080de79c39.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616379296129024/2619836334489600/STEM/612e60a7-b92b-47d0-88fa-4473b773cca8.png?resizew=164)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.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)
(2)解决问题:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74aa9a5332ccc8993faa3074ca643224.png)
(3)问题拓展:如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1120e471627069e78a6733af07687684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdfb5cc6da5848c72014186f3e363087.png)
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7 . [教材呈现]如图是华师版八年级上册数学教材第69页的部分内容.
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516123873902592/2517030059565056/STEM/3650e4f12b5a42168778e3621724e279.png?resizew=487)
[方法运用]在
ABC中,AB=4,AC=2,点D在边AC上.
(1)如图①,当点D是边BC中点时,AD的取值范围是 .
(2)如图②,若BD:DC=1:2,求AD的取值范围.
[拓展提升](3)如图③,在
ABC中,点D、F分别在边BC、AB上,线段AD、CF相交于点E,且BD:DC=1:2,AE:ED=3:5.若
ACF的面积为2,则
ABC的面积为 .
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516123873902592/2517030059565056/STEM/3650e4f12b5a42168778e3621724e279.png?resizew=487)
[方法运用]在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图①,当点D是边BC中点时,AD的取值范围是 .
(2)如图②,若BD:DC=1:2,求AD的取值范围.
[拓展提升](3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516123873902592/2517030059565056/STEM/379b9d47491b4eb998744de0d6444f15.png?resizew=475)
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2020-07-30更新
|
359次组卷
|
3卷引用:2020年吉林省长春市中考数学6月模拟试题
2018九年级·全国·专题练习
名校
解题方法
8 . 问题背景:如图1,等腰
中,
,作
于点D,则D为
的中点,
,于是
;
迁移应用:如图2,
和
都是等腰三角形,
,D,E,C三点在同一条直线上,连接
.
;
②请直接写出线段
之间的等量关系式;
拓展延伸:如图3,在菱形
中,
,在
内作射线
,作点C关于
的对称点E,连接
并延长交
于点F,连接
,
.
①证明
是等边三角形;
②若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d54cb14e377e3474e97365fc0e15f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eeb545ad4919ee00af43dd35d0488c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d026621bc4b2dbe4029364d8927801d3.png)
迁移应用:如图2,
![](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/d959ad0bf10a92c6c6be067f7094fcb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f04c6fa60799fba2f89cd7bfeef1f4.png)
②请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d3055b122bf4953a3d6cc92ab03d74.png)
拓展延伸:如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a806933a5b2364ea89db3cb3d4e8911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
2020-07-20更新
|
979次组卷
|
17卷引用:2年中考1年模拟 第七篇 专题复习篇 专题38 开放探究问题
(已下线)2年中考1年模拟 第七篇 专题复习篇 专题38 开放探究问题(已下线)2年中考1年模拟 第四篇 图形的性质 专题19 全等三角形(已下线)决胜2018中考压轴题全揭秘 专题14三角形问题(已下线)决胜2018中考压轴题全揭秘 专题28 探究型问题【全国校级联考】四川省眉山市丹棱县2018届九年级中考联考模拟数学试题【全国百强校】四川省成都嘉祥外国语学校2017-2018学年八年级下学期期末考试数学试题河南省洛阳市2018-2019学年八年级下学期期末考试数学试题四川省成都七中实验学校2020届九年级上学期入学考试数学试题(已下线)专题21 成都中考B27压轴题专版(决胜2020年中考压轴题全揭秘精品)四川专用四川省达州市第一中学2019-2020学年九年级下学期第五次月考数学试题(已下线)【万唯原创】2018年河南省中考数学试题研究-河南试卷-河南重难题型研究解答题重难点突破题型7(已下线)【万唯原创】2018年河南省中考数学面对面正文第二部分专题7(已下线)【万唯原创】2019年河南省中考数学面对面 专题八类比、拓展探究题2018年四川省眉山市丹棱县九年级中考一诊数学试题2020年包头市昆山区初中升学考试模拟卷(三)数学广东省深圳市深圳实验学校初中部2023-2024学年九年级上学期月考数学试题湖北省武汉市东西湖区2023-2024学年九年级下学期期中数学试题
9 . 通过类比联想、引申拓展研究典型题目,可达到解一题知一类的目的.
下面是一个案例,请补充完整.
原题:如图1,点
、
分别在正方形
的边
、
上,
,连接
,则
,试说明理由.
(1)思路梳理
,
把
绕点
逆时针旋转
至
,可使
与
重合.
,
,点
、
、
共线.易证
__________,从而可证得
.
(2)类比引申
如图2,四边形
中,
,
,点
、
分别在边
、
上,
.若
、
都不是直角,则当
与
满足等量关系_______________________ 时,仍有
.写出推理过程:
下面是一个案例,请补充完整.
原题:如图1,点
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/7c9af98a1a048b1e2f7c71e83c33498c.png)
(1)思路梳理
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d4647553eebbeb2b97b8a809620cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed920dfefe8829694c03de363b9de9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36527bcd85acdc04b71690d17aaaabfa.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/4f8705c91aa1f821f2edd98bc5a8f220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99242b39f86b3feb5752b06aa6e1f9e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28845c08c22197e91c52d526efe66db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
(2)类比引申
如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.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/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/b1c645c1-9671-4684-9c50-8f3c070c0791.png?resizew=300)
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10 . 我们通过“三角形全等的判定”的学习,可以知道“两边和它们的夹角分别相等的两个三角形全等”是一个基本事实,用它可以判定两个三角形全等;而满足条件“两边和其中一边所对的角分别相等”的两个三角形却不一定全等.下面请你来探究“两边和其中一边所对的角分别相等的两个三角形不一定全等”.
探究:已知
,求作一个
,使
,
,
(即两边和其中一边所对的角分别相等).
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
;②在线段
的上方画
;③画
.
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
明显不全等;
(3)小结
经历以上探究过程,可得结论:______.
探究:已知
![](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/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/c6911526-fd14-4993-a75b-0dee532faf5a.png?resizew=147)
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)小结
经历以上探究过程,可得结论:______.
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