1 . 如图,矩形
中,
分别为
的中点,且
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/e3fb9bfe-8acc-4ef3-a7cc-18e32a0a127d.png?resizew=129)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b62b997ff70441a93e187bb04b51be5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c051b0c20c3dfc23ee93c1810cfa237a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/e3fb9bfe-8acc-4ef3-a7cc-18e32a0a127d.png?resizew=129)
A.![]() | B.![]() | C.![]() | D.3 |
您最近一年使用:0次
2020-05-14更新
|
76次组卷
|
2卷引用:2019年黑龙江佳木斯市升学大考卷(三)数学试题
2 . “综合与实践”是以问题为中心,以活动为平台,以解决某一实际的数学问题为目标,综合应用知识和方法解决问题,它是对数学知识的延伸和发展,是对理解、运用数学基础知识和基本技能的升华过程.请同学们运用你所学的数学知识来研究和解决以下问题吧.
(1)探究:已知
是平面上一个运动的点,若
,
,则当点
位于 时,线段
的长最小,最小值为 ;若
,
,则当点
位于 时,线段
的长最小,最小值为 ;
(2)应用:已知
是一运动的点,
,
,如图①所示,分别以
为边作等腰直角三角形
和等腰直角三角形
,且
,连接
和
.
①在图中找出与
相等的线段,并说明理由;
②何时线段
可以取得最小值?请直接写出线段
的最小值;
(3)拓展:如图②,在矩形
中,
,
,
为矩形
对角线的交点,
为
边上任意一点,连接
并延长与
边交于点
,现将图中
与
分别沿
与
翻折,使点
与点
分别落在矩形
内的点
,
处,连接
,则
的长有最小值吗?若有,请直接写出
的长的最小值;若没有,请说明理由.
(1)探究:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3015db5ca1f49bb7bad43657e06863ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)应用:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51253b21bafa0cf5a374242e65be6864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①在图中找出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②何时线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展:如图②,在矩形
![](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/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458882623610880/2459770084130816/STEM/654207dd2a61453a9e8b6adf57ccbd0f.png?resizew=486)
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3 . 如图,点E、F、G、H分别是矩形ABCD边AB、BC、CD、DA上的点,且HG与EF交于点I,连接HE、FG,若AB=6,BC=5,EF//AD,HG//AB,则HE+FG的最小值是_____ .
![](https://img.xkw.com/dksih/QBM/2020/5/5/2456227778682880/2456874637680641/STEM/28062b8160454008aea4404604bb8faa.png?resizew=95)
您最近一年使用:0次
名校
4 . 如图,P 为矩形 ABCD 内一点,PB=PC,∠BPC=90°,∠PAB=75°,若 AB=11
,PD=14,则 PA 的长为_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/ad798052-efd6-4221-bc31-daf95d3c4ee0.png?resizew=202)
您最近一年使用:0次
2020-05-06更新
|
257次组卷
|
3卷引用:黑龙江省哈尔滨市第六十九中学校 2019-2020学年八年级下学期期中数学试题
名校
5 . 如图1,在平行四边形ABCD中,对角线AC、BD交于点O,经过点O的直线AD于点E,交BC于点F.
(1)求证:OE=OF;
(2)如图2,连接AF、CE,当AF⊥FC时,在不添加辅助线的情况下,直接写出等于
的线段.
(1)求证:OE=OF;
(2)如图2,连接AF、CE,当AF⊥FC时,在不添加辅助线的情况下,直接写出等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/8987f03f-5117-49b8-af34-d06557cba316.png?resizew=467)
您最近一年使用:0次
2020-05-06更新
|
125次组卷
|
3卷引用:黑龙江省哈尔滨市第七十中学2019-2020学年八年级下学期期中数学试题
名校
6 . 如图,矩形ABCD中,AB=12,点E是AD上的一点,AE=6,BE的垂直平分线交BC的延长线于点F,连接EF交CD于点G.若G是CD的中点,则BC的长是__________ .
您最近一年使用:0次
2020-05-06更新
|
754次组卷
|
6卷引用:湖北省武汉市东湖高新区2019-2020学年八年级下学期期中在线数学试题
7 . 已知:四边形
中,对角线
、
相交于点
,
,
.
(1)如图1,求证:四边形
为平行四边形;
(2)如图2,
,
,
,
,
,求四边形
的面积.
![](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/5fce05f91ce17863abc8a5a8f6002b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/25a09c6a-4141-4945-b559-75febabd100f.png?resizew=378)
(1)如图1,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d4224bc2697567f30195aceab0d2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723ba035704db9633cd6bb2bd51baf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768f344380477c983adc1d241c14f65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7317d43414d8d968f0cb11f533f1de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
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8 . 如图
是矩形
的对角线
分别是
上的动点,
则
的最小值为____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647db503c96fa101b1ca412d905efba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366ee83657af6cee9c8e6c4e5dd95399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5927083fbd926be2db861a7c38753d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fad3d2be13f11a8003f1547a24e8197.png)
![](https://img.xkw.com/dksih/QBM/2020/4/28/2451081549930496/2453568396771328/STEM/43732d3b68a44227accf4168a905b833.png?resizew=220)
您最近一年使用:0次
9 . 如图,矩形
中,点
在
的延长线上,
,连结
交
于点
,若
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/726a716fcd2557b553b16ea9305e4282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4144a4163554d6e13541262b66d8593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb54284604e909725748caea63cee0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/c43c49fd-f140-482c-a909-b56e3bed50e9.png?resizew=173)
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10 . 矩形
中,
平分
,交直线
于点
,若
,
,则
的长为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da328dfa8bf039cedc09b8e2e1a4a17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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