如图,点
是
内一点,连结
、
,并将
、
、
、
的中点
、
、
、
依次连结,得到四边形
.
是平行四边形;
(2)如果
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df0c656386b2889c4556d8309508463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652e46d08bb680f292cf918bd4d08a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd3fd00798e7ec50afafe7fa7a4f42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
22-23八年级下·福建龙岩·期中 查看更多[5]
福建省龙岩市新罗区未来城实验学校2022-2023学年八年级下学期期中数学试题(已下线)专题24.4 含30度角的直角三角形五大题型-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)人教版八年级下学期期中考试模拟卷(范围:第十六章-第十八章)-【好题汇编】备战2023-2024学年八年级数学下学期期中真题分类汇编(人教版)(已下线)专题03 平行四边形的性质和判定之八大题型-【好题汇编】备战2023-2024学年八年级数学下学期期中真题分类汇编(人教版)广东省广州市广雅中学2023-2024学年八年级下学期期中数学试题
更新时间:2023-09-15 12:42:50
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图①,点D是等边
中线
上一点,连接
,
为等边三角形,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/9b7c021f-8508-4786-a13e-115e7868a0a9.png?resizew=465)
(1)求证:
;
(2)如图②,当D在线段
的延长线上,求证:
;
(3)如图③,
,点D是射线
的动点,是否其中存在以D、C、E为顶点的菱形,若存在,请直接写出线段
的长度(不写过程),若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/9b7c021f-8508-4786-a13e-115e7868a0a9.png?resizew=465)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
(2)如图②,当D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,在
中,
是
边上一点,
平分
交
于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/e67a11ae-142c-453d-98ad-eec19dae04da.png?resizew=178)
(1)求证:
;
(2)过点
作
于点
,若
.
①求证:
;
②请直接写出
、
、
满足的数量关系,不必说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9e89a70b8b446861ce6f35fa83b251.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/e67a11ae-142c-453d-98ad-eec19dae04da.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d445d6b56717632e0cc10e883ed3b02.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9d0c688e55286443c9974797fc647f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215bc28569bd288cd9a5239ae2a43ebd.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
②请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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名校
【推荐1】如图,已知
的直径
垂直于弦
于点E,过C点作
交
的延长线于点G,连接
并延长交
于点F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/be69b30f-9965-49da-b0a4-e870963c49b6.png?resizew=145)
(1)试问:
是
的切线吗?说明理由;
(2)请证明:E是
的中点;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/5917b07a22333ed23e3ccfe65f19db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/be69b30f-9965-49da-b0a4-e870963c49b6.png?resizew=145)
(1)试问:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)请证明:E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-问答题
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【推荐2】如图1,△ABC中,CD⊥AB于D,且BD:AD:CD=2:3:4,
(1)试说明△ABC是等腰三角形;
(2)已知S△ABC=30cm2,如图2,动点M从点D出发以每秒2cm的速度沿线段DA向点A运动,同时动点N从点A出发以每秒3cm的速度沿线段AC向点C运动,当其中一点到达终点时整个运动都停止. 设点M运动的时间为t(秒),
①若△DMN的边MN与BC平行,直接写出t的值;
②若点E是边AC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
(1)试说明△ABC是等腰三角形;
(2)已知S△ABC=30cm2,如图2,动点M从点D出发以每秒2cm的速度沿线段DA向点A运动,同时动点N从点A出发以每秒3cm的速度沿线段AC向点C运动,当其中一点到达终点时整个运动都停止. 设点M运动的时间为t(秒),
①若△DMN的边MN与BC平行,直接写出t的值;
②若点E是边AC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/19a677f9-d59b-460d-8655-cee6861a2f05.png?resizew=554)
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解答题-证明题
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【推荐1】如图,在
ABCD中,E、F是对角线AC上的点,AE=CF,DE
BF,
(2)求证:四边形BEDF是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)求证:四边形BEDF是平行四边形.
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【推荐2】如图,在矩形
中,
是对角线
的中点,过点
作直线分别与矩形的边
,
交于
,
两点,连接
,
.
(1)求证:四边形
为平行四边形;
(2)若
且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/2086ab46-adbc-4f04-a85d-8d421c7e334f.png?resizew=172)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b49da6ed5141fe911ec817d5f538bcd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
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【推荐1】小明在学习矩形这一节时知道“直角三角形斜边上的中线等于斜边的一半”,由此引发他的思考,这个定理的逆命题成立吗?猜想:“如果一个三角形一边上的中线等于这条边的一半,那么这个三角形为直角三角形”.
通过探究,小明发现这个猜想也成立,以下是小明的证明过程:
已知:如图1,在
中,D是
边的中点,连接
,且
.
求证:
为直角三角形.
证明:由条件可知,
,则
,
.
又∵
,
∴
,即
为直角三角形.
爱动脑筋的小明发现用本学期所学知识也能证明这个结论,并想出了图2,图3两种不同的证明思路,请你选择其中一种,把证明过程补充完整:
AI
通过探究,小明发现这个猜想也成立,以下是小明的证明过程:
已知:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
证明:由条件可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd72e399cbc9beead45a955482dd315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665d580fd893b1006567c5cd47899dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d19311e1cb7f257049ac77b6a8bd90.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5453d76bc6852432ebd42fa6ed4ed49.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a1547f7fd3d97c860a915455c177e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
爱动脑筋的小明发现用本学期所学知识也能证明这个结论,并想出了图2,图3两种不同的证明思路,请你选择其中一种,把证明过程补充完整:
证法一:如图2,延长![]() ![]() ![]() ![]() |
证法二:如图3,分别取![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/249324c3-e5ac-410d-9784-a16faf378ce3.png?resizew=370)
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解答题-证明题
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【推荐2】已知:如图,在
中,点D、E分别是边
、
的中点,点F、G是边
的三等分点,
、
的延长线相交于点H.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/983f2ba3-28b2-4c92-8ee8-e66bc74b8d87.jpg?resizew=231)
(1)四边形
是平行四边形;
(2)四边形
是平行四边形.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/983f2ba3-28b2-4c92-8ee8-e66bc74b8d87.jpg?resizew=231)
(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b07813edf63bca1db33ad6d3a2d69a.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bf39b6c78f5b45d8e5e908960e2cf5.png)
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