名校
1 . 四边形ABCD是矩形,点E在线段CB的延长线上,连接DE交AB于点F,∠AED=2∠CED,点G是DF的中点.BE=1,AG=4,则CD=_____ .
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712432082952192/2715929442582528/STEM/f7efc58584a4443dba22f83b86003782.png?resizew=179)
您最近一年使用:0次
2021-05-07更新
|
308次组卷
|
3卷引用:黑龙江省大庆市第六十九中学2020-2021学年上学期初四年级第四次月考数学试题
19-20九年级下·浙江·期末
2 . 如图,四边形
内接于
,
,对角线
为
的直径,过点C作
的切线交
的延长线于点E,过点B作
,交边
于点H,G,F.
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714348364087296/2714503348977664/STEM/c165a65835e44f4d8e125edafbdb089a.png?resizew=216)
(1)求证:
.
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6835c19a6d58480f26751cc17c8efa9e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714348364087296/2714503348977664/STEM/c165a65835e44f4d8e125edafbdb089a.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142a94de8a7c2f8ce163664f9d473760.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f5dff88624c3fb8d4ff4dabcac8db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80853dbdcd65b4eef3556e1e691a1018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
19-20九年级下·浙江温州·期末
3 . 如图,在四边形
中,
,
经过点A,B,C,分别交边
于点D,E,且E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/bb7820b3-5837-4417-b7dd-18bc16fcad9b.png?resizew=152)
(1)求证:E是
的中点;
(2)连结
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba6f4177822927b5875b92cd5f2038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b88cf6dadd25cf5bbc4b5fff7f6d3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441b09d426d4db3f7de41da79ba62802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/bb7820b3-5837-4417-b7dd-18bc16fcad9b.png?resizew=152)
(1)求证:E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e07c646839df6240207ef62c839409c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
19-20九年级下·浙江温州·期末
解题方法
4 . 如图1是一盏可调节台灯,图2,图3为示意图,
为固定底座,且
于点O,
为固定支撑杆,
为可绕着点B旋转的调节杆,灯体
始终保持垂直
为台灯照射在桌面的区域,如图2,旋转调节杆使
,已知此时
,
,点M恰好为
的中点,此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743c30a2441c1f947ea612e182238003.png)
______ ,如图3,旋转调节杆使
,则此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ebbece8044a32fedfb1193fc508f9a.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa87ac2b7d6a58f5aaee923d83f799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3186a4736a9f5ee3aa5efd4aa8a7b9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f281bf278cd57688822ef5213a4bcec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743c30a2441c1f947ea612e182238003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af089fd292ba69ddef79e9ab1cac77ca.png)
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714351127707648/2714475180621824/STEM/ba4fa372-ee7a-4f67-bcc4-7f462945280c.png)
您最近一年使用:0次
19-20九年级下·浙江温州·期末
5 . 如图是一种手机三脚架,它通过改变锁扣C在主轴
上的位置调节三脚架的高度,其它支架长度固定不变.已知支脚
,底座
,且
,F是
上的固定点,且
.当点B,G,E三点在同一直线上(如图1所示)时,测得
;若将点C向下移动
,则点B,G,F三点在同一直线上(如图2),此时点A离地面的高度是_____
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e861067b81796fb676892281f60e83b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ece7669b5ceb1f68957abe3bbd4612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4627411c85b296bb9ce3d078c107926a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75816cd0f569358c92d0303b3c4dfdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb6ba6a20d59ed6800fdd0e2ca5727c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/31ece247-bf2b-42a3-bebf-9636ec2aaa1c.png?resizew=353)
您最近一年使用:0次
名校
6 . 如图,在
中,
,
,
,
为边
上一动点,
于
,
于
,连接
,则
的最小值为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca0940f5c21431c089d4f7a221df43c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703466816954368/2710208381009920/STEM/14c2702b801941e1b1bd3fcb3d49aca9.png?resizew=189)
您最近一年使用:0次
2021-04-29更新
|
620次组卷
|
18卷引用:人教版数学八年级下册 第十八章 平行四边形 特殊平行四边形的性质与判定 专题练习
人教版数学八年级下册 第十八章 平行四边形 特殊平行四边形的性质与判定 专题练习江苏省扬州市江都区国际学校2017-2018学年八年级下学期第一次月考数学试题【区级联考】江苏省宿迁市湖滨新区2018—2019学年八年级第二学期期中调研试卷数学试题【校级联考】江苏省淮安市洪泽区教育联盟校2018-2019学年八年级下学期期中考试数学试题【区级联考】江苏省宿迁市湖滨新区2018-2019学年八年级(下)期中数学试题【区级联考】江苏省淮安市洪泽区苏科版2018-2019学年八年级(下)期中数学试题安徽省潜山市第四中学2019届九年级下学期第三次检测数学试题海南省海口市第十四中学2018-2019学年八年级下学期第二次月考数学试题【校级联考】山东省日照市莒县2018-2019学年八年级(下)期中数学试题广东省深圳市龙岗区龙岗区智民实验学校2019-2020学年九年级上学期12月月考数学试题2020年山东省东营市利津县九年级中考一模数学试题山东省济宁市泗水县2019-2020学年八年级下学期期末数学试题山东省枣庄市薛城区奚仲中学、枣庄二十九中学、北临城中学等五校2020-2021学年九年级上学期12月联考数学试题江苏省徐州市2020-2021学年八年级下学期期中数学试题福建省三明市将乐县2021-2022学年九年级上学期期中数学试题福建省泉州市安溪县2021-2022学年八年级下学期期末数学试题湖南省长沙市湖南师大附中梅溪湖中学2021-2022学年八年级下学期第一次月考数学试题湖北省随州市广水市协作区2020-2021学年下学期八年级期中数学试题
7 . 如图,矩形
的对角线
,
相交于点
,过
点作
,过
点作
,
与
相交于点
.
(1)求证:四边形
是菱形;
(2)连接
、
,若
,
,求
的长.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3d56b7f0904c4966eab84ea17e9228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d20cc4143128fe1691ae03f3c54798f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1e902581960c17ad97a5e29e2c0c56.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2f01c5424e36922e1749aed45a8bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/4/25/2707495559413760/2707581733437440/STEM/1cc6ed6f4b694c948c797233482c018e.png?resizew=174)
您最近一年使用:0次
名校
8 . 如图是某个球放进盒子内的截面图,球的一部分露出盒子外,已知⊙O交矩形ABCD的边AD于点E,F,已知AB=EF=2,则球的半径长为( )
![](https://img.xkw.com/dksih/QBM/2021/4/22/2705060083359744/2706220406964224/STEM/2b21bc6068c64fedb35a79db21700cd5.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2021/4/22/2705060083359744/2706220406964224/STEM/2b21bc6068c64fedb35a79db21700cd5.png?resizew=192)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-04-23更新
|
337次组卷
|
3卷引用:黑龙江省大庆市第六十九中学2020-2021学年上学期初四年级第四次月考数学试题
9 . 在平面直角坐标系中,点
为坐标原点,抛物线
交
轴负半轴于点
,交
轴正半轴于点
,交
轴于点
,且
.
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699678655799296/2702344993456128/STEM/402241b3-85cc-461e-829d-bd7b2983dc3a.png)
(1)求这个抛物线的解析式;
(2)如图1,点
为第三象限抛物线上的点,设点
的横坐标为
,
面积
,求
与
的函数解析式(直接写出自变量
的取值范围);
(3)如图2,在(2)的条件下,
为
延长线上的一点,若
到
轴的距离为
,
的面积为
,且
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cbf4a0b81b41ba29296e3ea58e1e17.png)
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699678655799296/2702344993456128/STEM/402241b3-85cc-461e-829d-bd7b2983dc3a.png)
(1)求这个抛物线的解析式;
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57124599d0a72bf788f08ce442a85600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e705de89b12d92bfe47a88a8d201db6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2021-04-18更新
|
127次组卷
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2卷引用:广东省湛江市霞山区智洋学校2020-2021学年八年级上学期10月月考数学试题
10 . 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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542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