如图,在四边形
中,
,
,点
在
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/845f3bd4-d015-42a9-b500-58197dd24e54.jpg?resizew=103)
(1)求证:
.
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f135ae4531e59a3c5a7c1e475a5e8934.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/845f3bd4-d015-42a9-b500-58197dd24e54.jpg?resizew=103)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604a80b177865712cd42f48fa7c3a09d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
22-23九年级上·河北石家庄·期中 查看更多[7]
河北省石家庄西山学校2022-2023学年九年级上学期期中考试数学试题京改版九年级数学上册 第十八章相似形单元测试山西省大同市第二中学校2022-2023学年九年级上学期期末数学试题(已下线)第02讲 相似三角形的判定与性质(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学上册《知识解读·题型专练》(浙教版)(已下线)专题4.44 相似三角形几何模型(一线三等角)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题4.43 相似三角形几何模型(一线三等角)(基础练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)(已下线)清单15 相似三角形的性质与判定(3个考点梳理+17种题型解读+提升训练)-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
更新时间:2023-09-20 01:05:19
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在四边形
中,已知
,
.点
、
都在直线
上,
,
平分
交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721603911917568/2787337959391232/STEM/036a5daf-343c-4850-860c-c2decae876fb.png?resizew=572)
(1)如图1,点
、
为射线
上的点,若
,求
的度数;
(2)如图2,点
、
为射线
上的点.
①若
,求
的度数;
②若
,则
的度数为__________.(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d6404e43d054e28c3beb54af8e4013.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22efea5ffde65434469b5c9e3aa0c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db0641078052bf1af17b4c5a01b9ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721603911917568/2787337959391232/STEM/036a5daf-343c-4850-860c-c2decae876fb.png?resizew=572)
(1)如图1,点
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38585f6d635ad061ab3963422be4d420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)如图2,点
![](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/9e52a8f07834cbbbe4224962672fbbb2.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032a2b9d7d169436cdb842be77d2990b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0b4545790e8f9c0221d3457dc5a2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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名校
【推荐2】如图,在
中,
,
,分别过点
、点
作过点
的直线的垂线
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/2675045c-1cfd-44af-8ae6-5efd2a3f5389.png?resizew=172)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a03841966d8142fa4a4aed023e37931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/2675045c-1cfd-44af-8ae6-5efd2a3f5389.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ed9988aad9519d7b8a769169c10913.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】如图,直线AB//CD,直线
与
,
分别相交于E,F,点M是线段
上任意一点(点M不与点F重合),点N是直线
上一动点(点N不与点F重合)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/ceebcf2f-8bbc-4edc-a51b-f25acfc78263.png?resizew=435)
(1)如图①,当点N在射线
上运动时,
与
有什么关系?请说明理由;
(2)如图2,当点N在射线
上运动时,(1)中的关系还成立吗?如果不成立,请写出
与
的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/ceebcf2f-8bbc-4edc-a51b-f25acfc78263.png?resizew=435)
(1)如图①,当点N在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d86c283614a8fe0c6f5d2afdc7a3e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
(2)如图2,当点N在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d86c283614a8fe0c6f5d2afdc7a3e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
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【推荐2】“小头爸爸”为了检查“大头儿子”对平行线的条件与性质这部分知识的掌握情况,给他出了一道题:如图,
,
,
平分
,
平分
,求证
.“大头儿子”稍加思索,就做出来了,你知道他是怎样解的吗?请把你的推理过程写下来吧.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7013cc4303c7ac5d0f03c85423f0c258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685d7f4b01cb83c7165de819aa5ec6b6.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140796809248768/3154621391659008/STEM/923b91455c704a5ead506447c8fd9788.png?resizew=179)
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【推荐1】人教版初中数学八年级下册第53页告诉我们直角三角形的一个性质:“直角三角形斜边上的中线等于斜边的一半”,我们一起来探究这条性质的证明过程:
(2)定理应用:如图2,Rt△ABC中,∠ACB=90°,点D为边AC上一点,DE⊥AB于点E,连接BD,点M为BD的中点,CM的延长线交AB于点F,连接EC、EM.
①请直接写出线段CM与EM的数量关系________________;
②若BD是∠ABC的平分线,且∠BAC=38°,则∠EMB=________(直接写出结果无需证明).
如图1,在![]() ![]() ![]() ![]() 求证: ![]() 证明:延长 ![]() ![]() ![]() ![]() ![]() |
(2)定理应用:如图2,Rt△ABC中,∠ACB=90°,点D为边AC上一点,DE⊥AB于点E,连接BD,点M为BD的中点,CM的延长线交AB于点F,连接EC、EM.
①请直接写出线段CM与EM的数量关系________________;
②若BD是∠ABC的平分线,且∠BAC=38°,则∠EMB=________(直接写出结果无需证明).
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【推荐2】如图,将一个直角三角形纸片
,沿线段
折叠,使点
落在
处,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5203fe9b3945245bbab036282e6f12c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e490c0634869a950cca7e99fa6c231a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ac7f6b05b446d612353a68876e8701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/f9d67f97-8301-40ce-b8c2-ca496e3eb9e5.png?resizew=196)
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【推荐1】已知,在矩形ABCD中,AB=a,BC=b,动点M从点A出发沿边AD向点D运动(点M与点A、点D不重合).
(1)如图1,当b=2a,点M运动到边AD的中点时,请证明∠BMC=90°;
(2)如图2,当a=2,b=5,求点M运动到什么位置时,∠BMC=90°;
(3)如图3,在第(2)问的条件下,若另一动点N从点C出发沿边C→M→B运动,且点M、点N的出发时间与运动速度都相同,过点N作AD和垂线交AD于点H,当△MNH与△MBC相似时,求MH的长.
(1)如图1,当b=2a,点M运动到边AD的中点时,请证明∠BMC=90°;
(2)如图2,当a=2,b=5,求点M运动到什么位置时,∠BMC=90°;
(3)如图3,在第(2)问的条件下,若另一动点N从点C出发沿边C→M→B运动,且点M、点N的出发时间与运动速度都相同,过点N作AD和垂线交AD于点H,当△MNH与△MBC相似时,求MH的长.
![](https://img.xkw.com/dksih/QBM/2016/12/7/1579031876812800/1579031877378048/STEM/ba26b6e6f9d84937a29703d963a7cca5.png)
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【推荐2】如图,函数
与直线
交于点
和点
.
对应的函数关系式;
(2)直线
,交
轴于点
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cb90e72041e9139d4964f529ae1728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756504d289bf7128458b8654b25e98fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431bf182df5eea23cd1fe61822af7157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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