名校
1 . 如图,在平面直角坐标系中,点O为坐标原点,AB∥OC,点B,C的坐标分别为(15,8),(21,0),动点M从点A沿A→B以每秒1个单位的速度运动;动点N从点C沿C→O以每秒2个单位的速度运动.M,N同时出发,设运动时间为t秒.
(1)在t=3时,M点坐标 ,N点坐标 ;
(2)当t为何值时,四边形OAMN是矩形?
(3)运动过程中,四边形MNCB能否为菱形?若能,求出t的值;若不能,说明理由.
(1)在t=3时,M点坐标 ,N点坐标 ;
(2)当t为何值时,四边形OAMN是矩形?
(3)运动过程中,四边形MNCB能否为菱形?若能,求出t的值;若不能,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/aa1b1c3e-c953-4a32-b55c-a4a3fb83c34d.png?resizew=261)
您最近一年使用:0次
2021-05-26更新
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272次组卷
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7卷引用:河南省洛阳市洛阳外国语学校2018-2019学年八年级下期5月月考数学试题
2 . 如图,在矩形
中,
,
,点
是
上(不含端点
,
)任意一点,把
沿
折叠,当点
的对应点落在矩形
的对角线上时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716625101332480/2717898606067712/STEM/45218b89-93b3-4f16-bae0-597a5fd51076.png)
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2021-05-10更新
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191次组卷
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7卷引用:2016届河南省商丘市中考四模数学试卷
2016届河南省商丘市中考四模数学试卷2019年河南省重点中学内部模拟数学(二)试题(已下线)【万唯原创】2017年河南省中考数学试题研究专项-数学选填全真模拟演练9+10河南省长垣市统考2021年九年级数学模拟测试卷2021年河南省新乡市长垣县中考数学模拟试题(已下线)专题04 折叠问题-备战2022年中考数学母题题源解密(河南专用)山东省聊城市东昌府区东昌府区运河实验学校2023-2024学年九年级上学期期末数学试题
3 . 如图,四边形ABCD是边长为3的正方形,点E在边AD所在的直线上,连接CE,以CE为边,作正方形CEFG(点C、E、F、G按顺时针排列),连接BF.
(1)如图1,当点E与点D重合时,BF的长为 ;
(2)如图2,当点E在线段AD上时,若AE=1,求BF的长;(提示:过点F作BC的垂线,交BC的延长线于点M,交AD的延长线于点N.)
(3)当点E在直线AD上时,若AE=4,请直接写出BF的长.
(1)如图1,当点E与点D重合时,BF的长为 ;
(2)如图2,当点E在线段AD上时,若AE=1,求BF的长;(提示:过点F作BC的垂线,交BC的延长线于点M,交AD的延长线于点N.)
(3)当点E在直线AD上时,若AE=4,请直接写出BF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/79a3ed83-ba16-4aaa-829b-741579e19e39.png?resizew=457)
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2021-04-11更新
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543次组卷
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3卷引用:河南省许昌市2017-2018学年八年级下学期期末数学试题
4 . 如图,已知菱形
的对角线
,
交于点
,分别过点
,
作
,
的垂线,两垂线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/bf91d4c2-3901-4721-afad-93e9587d115b.png?resizew=155)
(1)请判断四边形
的形状并给出证明;
(2)若四边形
的面积为12,点
是四边形
对角线
的中点,且
,请计算四边形
的周长.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/bf91d4c2-3901-4721-afad-93e9587d115b.png?resizew=155)
(1)请判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc44fd8465b740d54ca1d69dbd06ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3827554ef88bce8ae0e3755b07443080.png)
您最近一年使用:0次
2021-03-08更新
|
247次组卷
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2卷引用:河南省郑州市新郑市2020-2021学年九年级上学期期中数学试题
5 . 汝阳某公司举办热气球表演来庆祝开业,如图,小敏、小亮从A,B两地观测空中C处一个气球,分别测得仰角为
和
,A、B两地相距100 m.当气球沿与BA平行地飘移100秒后到达D处时,在A处测得气球的仰角为
.
![](https://img.xkw.com/dksih/QBM/2020/12/18/2623781958598656/2630456058773504/STEM/01cdca9d-0b2f-4a61-a6bd-43182570527a.png?resizew=239)
(1)求气球的高度;
(2)求气球飘移的平均速度.(参考数据:
,
,
,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2623781958598656/2630456058773504/STEM/01cdca9d-0b2f-4a61-a6bd-43182570527a.png?resizew=239)
(1)求气球的高度;
(2)求气球飘移的平均速度.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67802092c4c9f3b1cff1f9502b7d1ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
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名校
6 . 如图,矩形ABCD和矩形CEFG,AB=1,BC=CG=2,CE=4,点P在边GF上,点Q在边CE上,且PF=CQ,连结AC和PQ,M,N分别是AC,PQ的中点,则MN的长为___ .
![](https://img.xkw.com/dksih/QBM/2020/12/14/2613977862430720/2614228560125952/STEM/9eef3d0970ae4778b76ce574ede22dc6.png?resizew=174)
您最近一年使用:0次
2020-12-24更新
|
356次组卷
|
4卷引用:浙江省温州育英2020--2021学年八年级上学期11月月考数学试题
浙江省温州育英2020--2021学年八年级上学期11月月考数学试题2022年河南省郑州市九年级中考二模模拟数学试题卷(已下线)【新东方】【2021.5.19】【SX】【初二下】【初中数学】【SX00010】(已下线)专题21 填空题压轴题之几何综合计算-备战2022年中考数学临考题号押题(全国通用)
解题方法
7 . 如图,在矩形ABCD中,
=
,F、G分别为边AB、DC上的动点,连接GF,将四边形AFGD沿GP折叠,使点A落在边BC上的点E处,得到四边形EFGP,EP交CD于点 H,连接AE交GF于点O.
(1)GF与AE之间的位置关系是 .
(2)求
的值.
(3)连接CP,若tan∠CGP=
,GF=2
,请直接写出CP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775c0ddaeb41dc57fa945aa7078cb5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)GF与AE之间的位置关系是 .
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af599221c4d97913167f86fd2bcf4bd.png)
(3)连接CP,若tan∠CGP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://img.xkw.com/dksih/QBM/2020/12/21/2619136719249408/2620442391601152/STEM/93b82882e32d4b289f759dca62d2891a.png?resizew=118)
您最近一年使用:0次
2020-12-23更新
|
127次组卷
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2卷引用:河南省洛阳市洛宁县2020-2021学年九年级上学期第三次月考数学试题
名校
8 . 求证:直角三角形斜边上中线等于斜边的一半.
已知:如图,在
中,
,点
是
的中点.求证:
.
![](https://img.xkw.com/dksih/QBM/2020/11/2/2584234017480704/2585585488175104/STEM/2fba4152de8f40c4a475ffc4016ee1ba.png?resizew=171)
证明:延长
到
,使
,
连接
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
中间的证明过程排乱了:
①∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
②∵
,
;
③∴四边形
是平行四边形;
④∴四边形
是矩形.
∴
,∴
.
则中间证明过程正确的顺序是( ).
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.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/4fc58dc365e8bb140a95746bbfb5abb6.png)
![](https://img.xkw.com/dksih/QBM/2020/11/2/2584234017480704/2585585488175104/STEM/2fba4152de8f40c4a475ffc4016ee1ba.png?resizew=171)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
中间的证明过程排乱了:
①∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
②∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434384585c6dcae0e0f2a2b4a8a12900.png)
③∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
④∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb327ea45497cfa5724ea984b92569ee.png)
则中间证明过程正确的顺序是( ).
A.①④②③ | B.①③②④ | C.②④①③ | D.②③①④ |
您最近一年使用:0次
2020-11-04更新
|
485次组卷
|
8卷引用:2020年河北省衡水市九年级初中毕业生升学文化课模拟(一)数学试题
解题方法
9 . 如图,在四边形ABCD中,
,
,
,
,
,动点P从A点开始沿AD边以
的速度向点D运动,动点Q从C点开始沿CB边以
的速度向点B运动,P,Q分别从A,C同时出发,当其中一个动点到达终点时,另一个动点也随之停止运动.设运动的时间为
.
当t为何值时,四边形ABQP是矩形;
当t为何值时,四边形PQCD是平行四边形?
问:四边形PQCD是否能成菱形?若能,求出运动时间;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ee09a1a95ac258105e9593726c0e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbc372e97cd951e911f4f998ec5e829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f743ce475fa54665ccad227fbab3cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfe1d7818f723b1df2ea3b627af2b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288be36c43ce6b822cf03890823529ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef673d549774c2ba11b4cc592d43653a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4eae59a638cd457eac3cb05e4055c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65c407a0d0f359c82de418d0d08d9b6.png)
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2020-10-29更新
|
942次组卷
|
6卷引用:广东省河源市正德中学2020-2021学年九年级上学期第一次段考数学试题
名校
10 . 如图,在△ABC中,AB=6,AC=8,BC=10,P为边BC上一动点,PE⊥AB于E,PF⊥AC于F,M为EF中点,则AM的最小值为( )
![](https://img.xkw.com/dksih/QBM/2020/10/28/2580503228391424/2581030565076992/STEM/860191bc-4268-4a00-86e0-936c0bb8e4a8.png?resizew=233)
![](https://img.xkw.com/dksih/QBM/2020/10/28/2580503228391424/2581030565076992/STEM/860191bc-4268-4a00-86e0-936c0bb8e4a8.png?resizew=233)
A.![]() | B.![]() | C.![]() | D.![]() |
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