已知点E、F分别是四边形
边
上的点,且
与
相交于点G.
(1)如图①,若
,
,
,且
,求证:
;
(2)如图②,若
,
,求证:
;
(3)如图③,若
,
,当
时,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce8ebe684ab4fd905deddd160462847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/4b6bc1ac-cb10-4977-b3fb-f9d7ea8ccea6.png?resizew=416)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1034d8550b804899e1b6be3f6f8cf95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1575c99a4e89227be9436a46abc756b.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6de97256970c4f56abd84f3572d2eaa.png)
(3)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd0cc95217ffdaed3a7e50746683868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9cfa0686455571e9ae168077b03b46c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
17-18九年级·湖南常德·期中 查看更多[5]
【区级联考】湖南省常德市鼎城区2019届九年级(上)期中数学试题江苏省苏州市外国语学校2018-2019学年八年级第二学期期末考试数学试题湖南省永州市冷水滩区2021-2022学年九年级上学期期末数学试题2023年湖南省湘潭市湘潭县湘潭江声实验学校中考三模数学试题(已下线)专题07 相似三角形常考的模型及压轴题-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(湖南专用)
更新时间:2023-08-02 11:16:01
|
相似题推荐
解答题-证明题
|
较难
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【推荐1】在正方形ABCD的外侧,作△ADE和△DCF,连接AF、BE交于一点H.(友情提醒:正方形的四条边都相等,即AB=BC=CD=DA;四个内角都是90°,即∠ABC=∠BCD=∠CDA=∠DAB=90°)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/5f0637eb-4ea7-4bed-a921-c1140819ab68.png?resizew=262)
(1)如图①,若△ADE和△DCF是等边三角形,求证:AF=BE,AF⊥BE;
(2)如图②,若△ADE和△DCF为一般三角形,其中AE=DF,ED=FC,则第(1)问中的结论 AF=BE仍然成立吗?若成立,请给予证明;若不成立,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/5f0637eb-4ea7-4bed-a921-c1140819ab68.png?resizew=262)
(1)如图①,若△ADE和△DCF是等边三角形,求证:AF=BE,AF⊥BE;
(2)如图②,若△ADE和△DCF为一般三角形,其中AE=DF,ED=FC,则第(1)问中的结论 AF=BE仍然成立吗?若成立,请给予证明;若不成立,请说明理由.
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解答题-证明题
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【推荐2】如图,已知一次函数
的图象与
轴、
轴分别交于
、
两点,点
为平面内一点,
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896491202306048/2954911489163264/STEM/28b4127c-7b2a-4a4a-8bca-3787f29b4594.png?resizew=221)
(1)点
_______一次函数
的图象;(填“不在”或“在”)
(2)若一次函数
的图象经过点
,与
轴交于
点.
①求
的长;
②求证:
平分
;
③若正比例函数
的图象与一次函数
的图象交于点
,且点
、点
到一次函数
的图象的距离相等,则符合条件的
值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896491202306048/2954911489163264/STEM/28b4127c-7b2a-4a4a-8bca-3787f29b4594.png?resizew=221)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3b98a943cb9423ccd5884364c395ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
(2)若一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15206717884bea18dfe2d7099489f849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3b98a943cb9423ccd5884364c395ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c3ca226db5d490fa92bb1b7c8deb14.png)
③若正比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cca39b30b0b8e769293e13546b91f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15206717884bea18dfe2d7099489f849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-计算题
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【推荐1】如图,在Rt△ABC中,∠C=90º,AB=10cm,AC∶BC=4∶3,点P从点A出发沿AB方向向点B运动,速度为1cm/s,同时点Q从点B出发沿B→C→A方向向点A运动,速度为2cm/s,当一个运动点到达终点时,另一个运动点也随之停止运动.
(1)设点P的运动时间为x(秒),△PBQ的面积为y(cm2),当△PBQ存在时,求y与x的函数关系式,并写出自变量x的取值范围;
(2)当x=5秒时,在直线PQ上是否存在一点M,使△BCM得周长最小,若存在,求出最小周长,若不存在,请说明理由.
(3)当点Q在BC边上运动时,是否存在x,使得以△PBQ的一个顶点为圆心作圆时,另外两个顶点均在这个圆上,若存在,求出 x的值;不存在,说明理由.
(1)设点P的运动时间为x(秒),△PBQ的面积为y(cm2),当△PBQ存在时,求y与x的函数关系式,并写出自变量x的取值范围;
(2)当x=5秒时,在直线PQ上是否存在一点M,使△BCM得周长最小,若存在,求出最小周长,若不存在,请说明理由.
(3)当点Q在BC边上运动时,是否存在x,使得以△PBQ的一个顶点为圆心作圆时,另外两个顶点均在这个圆上,若存在,求出 x的值;不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2016/11/29/1574256138518528/1574256144670720/STEM/190351f66fa8483b98fa4a92c8a1fb42.png)
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解答题-证明题
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【推荐2】已知:如图①,AD为⊙O的直径,点A为优弧
的中点,延长BO交AC于点E.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901404095913984/2901507259105280/STEM/a0e252c5-e28d-485c-9b44-35813d2e484c.png?resizew=442)
(1)求证:∠BAC=2∠ABE;
(2)若△BCE是等腰三角形时,求∠BCE的度数;
(3)如图②,若弦BC垂直平分半径OD,连接DE交BC于点F,DF=a,EF=k•DF,S△BEF=1,M、N、P分别为直线BD、BF、DF上的三个动点,求△MNP周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901404095913984/2901507259105280/STEM/a0e252c5-e28d-485c-9b44-35813d2e484c.png?resizew=442)
(1)求证:∠BAC=2∠ABE;
(2)若△BCE是等腰三角形时,求∠BCE的度数;
(3)如图②,若弦BC垂直平分半径OD,连接DE交BC于点F,DF=a,EF=k•DF,S△BEF=1,M、N、P分别为直线BD、BF、DF上的三个动点,求△MNP周长的最小值.
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解题方法
【推荐1】如图,在四边形ABCD中,AC⊥AD,∠ABC=∠ADC.在BC延长线上取点E,使得DC=DE.
(1)如图1,当AD∥BC时,求证:①∠ABC=∠DEC;②CE=2BC;
(2)如图2,若tan∠ABC=
,BE=10,设AB=x,BC=y,求y与x的函数表达式.
(1)如图1,当AD∥BC时,求证:①∠ABC=∠DEC;②CE=2BC;
(2)如图2,若tan∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/8808796c-9564-4852-a4c2-02b0ed90592b.png?resizew=538)
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解答题-问答题
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名校
【推荐2】如图,在平面直角坐标系
中,直线
与y轴交于点
,直线
与x轴交于点B,点M,N分别是直线
,
在第一象限内的动点,且
,连接MN.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9410e515-afcf-43d0-b033-8b0a71c5bb8b.png?resizew=358)
(1)直接写出m的值,点B的坐标,
及
的度数;
(2)求
的值;
(3)当
是直角三角形时,直接写出点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f9e1c026cad3d8330877138df771c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04260da1cc3c03d5d063f12d8e5e1bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea400f26433d582037a3dc09c3a879cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce619c464f2aa04178ea0111ba60544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a9c04ba6ee9b24335c3f8a9e5bbcad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/9410e515-afcf-43d0-b033-8b0a71c5bb8b.png?resizew=358)
(1)直接写出m的值,点B的坐标,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5c3a067e489448bec815c0ef9cde36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/409f9584bfcf1dd411b0bcf62f3e92dc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a376bfe76093f073ecd48645342c722.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baefc8a9b711ab9f3741491fd298a119.png)
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名校
【推荐1】(1)如图1,矩形ABCD中,EF⊥GH,EF分别交AB,CD于点E,F,GH分别交AD,BC于点G,H,求证:
=
.
(2)如图2,在满足(1)的条件下,又AM⊥BN,点M,N分别在边BC,CD上,若
,则
的值为 .
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=12,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d12504c6da5f94ba2656ca727c2fe82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
(2)如图2,在满足(1)的条件下,又AM⊥BN,点M,N分别在边BC,CD上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5317ae921ee20693807afb13a950c422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d42e47b9110ef86d38b4dce6f7194f.png)
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=12,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f710f8f1fa0df203765d18692ded6a91.png)
![](https://img.xkw.com/dksih/QBM/2019/9/23/2297034786619392/2302616456413184/STEM/ac595922b4744168a3669c93dc014203.png?resizew=415)
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【推荐2】定义:若
中,其中一个内角是另一个内角的一半,则称
为“半角三角形”.
(1)若
为半角三角形,
,则其余两个角的度数为 .
(2)如图1,在平行四边形
中,
,点
在边
上,以
为折痕,将
向上翻折,点
恰好落在
边上的点
,若
,求证:
为半角三角形;
(3)如图2,以
的边
为直径画圆,与边
交于
,与边
交于
,已知
的面积是
面积的
倍.
①求证:
.
②若
是半角三角形,
,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1ba2766874730daaad7d3bb7a8ee4.png)
(2)如图1,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e664fe2b4fa44888b4681fca8e0e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9d0c688e55286443c9974797fc647f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de527d94728f42bb54140a2d98326b1a.png)
(3)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef6568efecdabf9e1a2ebeb8438e997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953f11eb95bfc036d85b472f81c6fb4e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d9fc9f2498c4759a33af476443f2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442706431229952/2442862879514624/STEM/b74d6e17-9be8-4ee1-a393-020a46200fe1.png)
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