已知,在
ABC中,AB=AC,在射线CA上截取线段CE,连接DE.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912606271324160/2913692397191168/STEM/01c104f9e2b74a43bef9cf800536c8bf.png?resizew=452)
(1)猜想:当点D在边AB的延长线上,点E在边AC上时,过点E作EF
AB交BC于点F,若BD=CE,则线段DM、EM的大小关系为 .
(2)探究:当点D在边AB的延长线上,点E在边CA的延长线上时,如图②.若BD=CE,线段DM、EM的大小关系,并加以证明.
(3)拓展:当点D在边AB上(点D不与A、B重合),点E在边CA的延长线上时,如图③.若BD=2,CE=8,DM=1.4.则ED的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912606271324160/2913692397191168/STEM/01c104f9e2b74a43bef9cf800536c8bf.png?resizew=452)
(1)猜想:当点D在边AB的延长线上,点E在边AC上时,过点E作EF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)探究:当点D在边AB的延长线上,点E在边CA的延长线上时,如图②.若BD=CE,线段DM、EM的大小关系,并加以证明.
(3)拓展:当点D在边AB上(点D不与A、B重合),点E在边CA的延长线上时,如图③.若BD=2,CE=8,DM=1.4.则ED的长为 .
22-23九年级上·吉林长春·期末 查看更多[1]
(已下线)吉林省长春市朝阳区长春南湖实验中学2021-2022学年九年级上学期期末数学试题
更新时间:2022-02-11 00:25:16
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解答题-证明题
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【推荐1】解答
(1)问题背景:如图①,已知
中,
,
,直线
经过点
,
直线
,
直线
,垂足分别为点
,
,易证: ______
______
______;(从图①中选择三条线段填空).
(2)拓展延伸:如图②,将(1)中的条件改为:在
中,
,
,
,
三点都在直线
上,并且有
,请写出
,
,
三条线段的数量关系,并证明;
(3)实际应用:如图③,在
中,
,
,点
的坐标为
,点
的坐标为
,请直接写出
点的坐标.
(1)问题背景:如图①,已知
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/bc921d0d-2e9d-4565-9eb2-04695066c0d3.png?resizew=175)
(2)拓展延伸:如图②,将(1)中的条件改为:在
![](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/8455657dde27aabe6adb7b188e031c11.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accabdbd6378d96aa70227b098d2d8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/1db71ea9-558f-4c1a-9e63-b24f9c73a0b0.png?resizew=162)
(3)实际应用:如图③,在
![](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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e96cd766187a0b56fb6a324675d611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/23a1110c-351a-43de-8604-db6649c83eac.png?resizew=146)
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【推荐2】如图,点C在以
为直径的
上.
与过点C的切线垂直,垂足为D,
交
于点E,过B作
交
于点F,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/1740213b-cad6-4e6e-90a6-d47d25e9963e.png?resizew=123)
(1)求证:
;
(2)已知
,
,求
和
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a288f1b88fb7872af5ad26e99d5d8acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/1740213b-cad6-4e6e-90a6-d47d25e9963e.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19171814ac05f2ad7a3f181cecc9a652.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐1】在△ABC中,D是BC中点,
,
,垂足分别是E,F,
.
求证:△ABC是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
求证:△ABC是等腰三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/d7e33642-02d6-4645-aa6b-3c822ddde0e9.png?resizew=180)
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【推荐2】如图,抛物线
与x轴交于
,
两点,与y轴交于点C,直线
与该抛物线交于E,F两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/6f83bd25-0bcd-4cf5-85ec-8d512c6addbe.png?resizew=194)
(1)求点C坐标及抛物线的解析式.
(2)P是直线
下方抛物线上的一个动点,作
于点H,求
的最大值.
(3)以点C为圆心,1为半径作圆,过点B作
的切线切点为点D,求切点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78531ca6d555e824f53ebae6adb666a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1d8d5cea065075fe50706abe3ae802.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/6f83bd25-0bcd-4cf5-85ec-8d512c6addbe.png?resizew=194)
(1)求点C坐标及抛物线的解析式.
(2)P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08be05647521af79a0e1c6b5557552c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
(3)以点C为圆心,1为半径作圆,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
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【推荐1】如图,
为
的直径,过点B作
的切线
,连接
,过点A作
交
于点D,连接
交
的延长线于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/e942a355-b61b-41fd-b118-2b367e6b1003.png?resizew=150)
(1)直线
与
相切吗?并说明理由;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e66bbec08fe6bc8d75a489b5c92ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/e942a355-b61b-41fd-b118-2b367e6b1003.png?resizew=150)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b50a72fd7a9fa3aa1135310e710a7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】如图1,
中,
,
,
为中线,点
为
边上一点,
,
于点
,
于点H
长为______;
(2)求
的值;
(3)如图2,连接
,求证:
.
![](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/07160f14b3b453bebb64cb2bf96dc85a.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d78524f98b01fa1dadfd277939665b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9677deecea626aa6e4078f0b532ba68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179f83b6490ae006ae5a536bd8b63db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f292bd578672ee7962d9457854ce96.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e0288ee6f3bea38c5a539fed1a93a.png)
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【推荐1】如图,在平面直角坐标系中,点
在
轴正半轴上,
轴,点
、
的横坐标都是
,且
,点
在
上,若反比例函数
的图象经过点
、
,且
.
(1)求
的值及点
的坐标;
(2)将
沿着
折叠,设顶点
的对称点
的坐标是
,求代数式
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d51fa2414dbedc6b24777b28a796c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1349f32361c3b4bcead02a9a0c258bf.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/9212e728b36c078188606c9d429389d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1c14e93deb7565a543e0f1a5956d38.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/0d4cd4ce-10b8-4e51-a7f1-734fa7d11fd8.png?resizew=165)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8396a7120abeaae6236a9292e5b9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb87eeb2d894172970f43d77e348d465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0946479c941fbedaec12db71df4db991.png)
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解答题-证明题
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【推荐2】如图,
为
的切线,A为切点.过A作
的垂线
,垂足为点C,交
于点B.延长
与
交于点D,与
的延长线交于点E.
(1)求证:
为
的切线;
(2)试探究线段
之间的等量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)试探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0d60f8bad67f109b043eb06b4bc346.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/ac315fc5-6d5c-446c-a0bc-a152cf6f03d6.png?resizew=153)
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