1 . 如图, 在菱形
中, 点E为
的中点, 将菱形
沿
翻折, 使点 C落在
上的点 F 处. 若
, 则折痕
的长为________ .
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
2 . 如图, 在
中,
于点E,
.则下列结论错误的是 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
A. ![]() | B.![]() |
C. ![]() | D.四边形 ![]() |
您最近一年使用:0次
3 . 求满足不等式组
的整数解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255b19d7fafefade45ac72f4ea287912.png)
您最近一年使用:0次
4 . 如图,在菱形
中,对角线
,
交于点O,过点A作
的垂线,垂足为点E,延长
到点F,使
,连接
.
(1)求证:四边形
是矩形;
(2)连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604cb37737fc9d58e19c73149105bb24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/3/8c25238e-7b52-4899-b3a4-01d9cfb6e2fc.png?resizew=150)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8057131f4bae6260aaeda1eb3c77fb7c.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a665df324c530f22911ebfc3cb300ec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2e71902d496ae375e2e8d163d29471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
您最近一年使用:0次
今日更新
|
332次组卷
|
4卷引用:湖北省荆门市龙泉北校2023-2024学年八年级下学期期中数学试题
5 . (1)问题背景:小刚遇到一个这样问题:如图
,两条相等的线段
,
交于点
,
,连接
,
,求证:
.通过尝试他发现通过平移可以解决这个问题.
证明:过点
作
且使
,连接
,
四边形
为平行四边形,则
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
,
又
,
为等边三角形,
,
,即
.
请完成证明中的三个填空.并参考小刚同学思考的方法,解决下列问题:
(2)类比运用:如图
,
与
相交于点
,
,
,
,
,
,求线段
的长;
(3)联系拓展:如图3,
的三条中线分别为
,
,
.三条中线的交点为
.若
的面积为
,则以
,
,
的长度为三边长的三角形的面积等于 (请直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fb66948f75acdc512312bef81bec07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3cd5634f31753b9a4f2e5462011c84.png)
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f530b7ce530b159df8339f93dc505c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132182fb9f12caccc4204bbef99f37bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d6f7a95c2c1484be3324e5a53953c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8628d40dd43e71e803542377ea7399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73e37c3b30b0bc64d30734cead82c4b.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a71d8fc13b8b20916408d673d10a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce86c50f571680761b819deb0bbf8a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c3e92db1551b7ca36fdd3e619cb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3af79014744fa37d6804ee186cc87f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3cd5634f31753b9a4f2e5462011c84.png)
请完成证明中的三个填空.并参考小刚同学思考的方法,解决下列问题:
(2)类比运用:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd0c00f62c22e90e7d542a2f8dd83d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49919f576b3d80f7ba01861a71fb373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36a1938df65db2b68bf7595b97bafa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c453a37da0d381f3e0d86dbcc234d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b30aafa9f055536b6eb2eacb4792c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(3)联系拓展:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11746005a0e806f2d27f89e3d9e9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
您最近一年使用:0次
6 . 如图, 在
中,
,
是
边上的高,
交
于点 E.
与
的位置关系;
(2)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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求证∶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
您最近一年使用:0次
7 . 桔槔俗称“吊杆”“称杆”,如图1所示,是我国古代农用工具,桔槔始见于《墨子·备城门》,是一种利用杠杆原理的取水机械.图2是桔棒的示意图,
是垂直于水平地面的支撑杆,
米,
是杠杆,且
米. 当点 A位于最高点时,
. 求点A位于最高点时到地面的距离.(结果精确到
米,参考数据: ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7815b592cf634769ac5637724caeda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d958f5219b501284e1554d9a8aec3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2d3f02cb9007cd4a90ea30f6dd8181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f58fdd6712254fade280a89d323db62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7815b592cf634769ac5637724caeda.png)
您最近一年使用:0次
8 . 阅读材料:善于思考的小聪同学在解方程组
时,采用了一种“整体换元”的解法.
解:把
,
看成一个整体,设
,
,原方程组可化为
,
解得
,∴
,∴原方程组的解为
.
(1)若方程组
的解是
,试求方程组
的解;
(2)仿照小聪同学的方法,用“整体换元”法解方程组
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1de4dc828ae2e2dfd3aa76e237110e.png)
解:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1e94f660b7d05de4be4b5fbd9041f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3468a665ac713ab7b400c672f19650a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9d86f93e260083f9230146ca6c6840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa82119623e64bb6bcbb640215f02f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508467b03d3047758de939d0795988f3.png)
解得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c11529fffcd6c1f7f415b76af261090f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5871fe3618e5d937274a0b34ae6039e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06217f4c60e54e1d05389519ac62fb0.png)
(1)若方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83b6e329ce23e6bf8d2d0c2496e71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7439ef73ff5fff6f9e1838753bc7bab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993854dc378ef5dc366a356f3c605f8d.png)
(2)仿照小聪同学的方法,用“整体换元”法解方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c26049df6683ac806c84bc92ec567e.png)
您最近一年使用:0次
昨日更新
|
481次组卷
|
3卷引用:湖北省荆州市2023-2024学年七年级下学期月考数学试题
湖北省荆州市2023-2024学年七年级下学期月考数学试题2023—2024学年七年级数学下册(人教版)期末模拟试题B卷(已下线)七年级数学期末必刷题01(基础题,66题36种题型)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)
9 . 如图,
,
, 若
, 则图中
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84756764173829ecd7d0272785c7e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f586d178cb0f69dd900967766ba8950a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 如图,某农户计划用篱笆围成一个矩形场地养殖家禽,为充分利用现有资源,该矩形场地一面靠墙(墙的长度为
),另外三面用篱笆围成,中间再用篱笆把它分成三个面积相等的矩形分别养殖不同的家禽,计划购买篱笆的总长度为
,设矩形场地的长为
, 宽为
, 面积为
.
(2)当x为何值时,矩形场地的总面积最大?最大面积为多少?
(3)若购买的篱笆总长增加
,矩形场地的最大总面积能否达到
若能,请求出x的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857aaa8fc6074c0d499298451e4e737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e084ae38a5dc1db3c411b5fd3787b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7f771ee0caa0143663939cb00451de.png)
(2)当x为何值时,矩形场地的总面积最大?最大面积为多少?
(3)若购买的篱笆总长增加
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea92883fe24b097c9a881ef8c92eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8efcf848e40683b1b608aac62062a09.png)
您最近一年使用:0次