1 . 如图,在
中,
,过点C作
于点D,过点B作
于点M,连接MD,过点D作
,交BM于点N,CD与BM交于点E.下列结论:①
;②
;③
;④
.其中正确结论有________ .(填写序号即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f843b83e62bab294988a7ea134a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef471a1af0098e8f6ff41723194537a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60777fcf95eded5256edfb218250ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b15fd5370fedb2cfe465a79365f9a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd884e4a63c2855a18de9b008a87469.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/69aae70e-7945-4c46-be86-380b2b993019.png?resizew=189)
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2 . 如图,在
中,
,
平分
,
于
.现给出下列结论:
![](https://img.xkw.com/dksih/QBM/2022/6/29/3011826782625792/3021842346270720/STEM/3a114d0b0311461c9e7818d2a33cecba.png?resizew=169)
①
;
②
;
③
;
④
.
其中正确的是_____________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/6/29/3011826782625792/3021842346270720/STEM/3a114d0b0311461c9e7818d2a33cecba.png?resizew=169)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489382983e41516ea36d0f30f4a272c1.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ab3b4cdb9f6454df3cc3f28e79f7ae.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4dc7531761a29c63d8b5b72982bd8.png)
其中正确的是
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2022-07-13更新
|
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2卷引用:福建省漳州市2021-2022学年七年级下学期期末教学质量检测(北师大版A卷)数学试题
3 . 如图,
,
,
,
于点H,HA的延长线交DE于点G,现给出下列结论:
①
;
②连接DC,BE,则
;
③
;
④
.
其中正确的是___________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26891f01df7816ca874413643fff81a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c470ba11b4498e31139a18563a6684e3.png)
②连接DC,BE,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a668fcb9a29eebda06220828d3b0877d.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e70bb0e23de1276b41b762be7794a6.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a5d84be7704cbb1c2d1d4bc3fb8bf2.png)
其中正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/fb2e9726-9990-4813-8573-161208d4e3c8.png?resizew=127)
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2022-07-13更新
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3卷引用:福建省漳州市2021-2022学年七年级下学期期末教学质量检测(北师大版B卷)数学试题
4 . 如图,△ABC中,AC=BC,∠C=90°,AD平分∠BAC,DE⊥AB于E,现给出以下结论:①AD平分∠CDE;②DE平分∠ADB;③∠BAC=∠BDE;④AC+BE=AB.其中正确的是________ .(写出所有正确结论的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a25d597c-2890-4d4e-973a-52c048dccea0.png?resizew=156)
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2卷引用:福建省三明市2021-2022学年七年级下学期期末数学试题
5 . 综合与探究:(1)如图(1),已知:在
中,
,
,直线m经过点A,
直线m,
直线m,垂足分别为点D、E.小明观察图形特征后猜想线段
、
与
之间存在
的数量关系,请你判断他的猜想是否正确,并说明理由.
拓展:(2)如图(2),将探究中的条件改为:在
中,
,D、A、E三点都在直线m上,并且有
,其中
为任意锐角或钝角.请问探究中的结论是否成立?如成立,请你给出证明;若不成立,请说明理由.
应用:(3)如图(3),D、E是D、A、E三点所在直线m上的两动点(D、A、E三点互不重合),点F为
分线上的一点,且
和
均为等边三角形.连接BD、CE,若
,请直接写出
的形状是_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb773a664fa72fc5d8fe377e9f891901.png)
拓展:(2)如图(2),将探究中的条件改为:在
![](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/e1cf8edbd31ff7e27c784c8688b537a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
应用:(3)如图(3),D、E是D、A、E三点所在直线m上的两动点(D、A、E三点互不重合),点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accabdbd6378d96aa70227b098d2d8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/35679ddf-8ad9-4675-9825-8df96f41d5a6.png?resizew=469)
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6 . 习题课上, 张老师和同学们一起探究一个问题∶ “如图, 在
中,
分别 是
上的点,
与
相交于点
, 添加下列哪个条件能判定
是等腰三角形?"请你判断正确的条件应为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7dd59925-8a73-4e77-8d07-f881f2f045cf.png?resizew=118)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cae7cc6665dc8edfb9060075b3afb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171d6aa50ea4b61d4e1f6132f166f1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/7dd59925-8a73-4e77-8d07-f881f2f045cf.png?resizew=118)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-08-07更新
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4卷引用:陕西省榆林市高新区2021-2022学年七年级下学期期末数学试题
陕西省榆林市高新区2021-2022学年七年级下学期期末数学试题(已下线)专题13.3 等腰三角形+专题13.4 最短路径问题-【帮课堂】2022-2023学年八年级数学上册同步精品讲义(人教版)(已下线)专题2.4 特殊三角形(一)(轴对称、等腰三角形与逆命题(定理)十大题型)重难点题型-2022-2023学年八年级数学上册重难题型全归纳及技巧提升专项精练(浙教版)(已下线)专题5.1 生活中的轴对称 重难点题型12个-2022-2023学年七年级数学下册重难题型全归纳及技巧提升专项精练(北师大版)
7 . 第一学习小组按照老师留的预习任务,对如下问题进行了自主探究性学习:
已知:如图1所示,在
中,
,
,
是
的中线,过点
作
,垂足为
,且交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/e3543278-d998-47ed-9217-31104d1bc0b1.png?resizew=665)
(1)【探究一:相等的角】
同学们用量角器度量后猜想
,请你先判断他们的猜想是否正确,再用所学知识说明理由;
(2)【探究二:相等的线段】
如图2所示,组员小亮在(1)的条件上添加了一条线段
,且
平分
交
于点
,即可得
,并给出了说明理由;请你和他共同完成下面的说理过程.
解:如图2中,
因为
平分
,
,
所以
,(依据:______)
因为
,
所以
,
所以
,
在
和
中,
因为______,______,______
所以
(依据:______),
所以
.(依据:______)
(3)【探究三:全等的三角形】
如图3所示,组员小刚在(2)的条件上,连接
,又发现了一组全等三角形,请直接 写出这组全等三角形.
已知:如图1所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/e3543278-d998-47ed-9217-31104d1bc0b1.png?resizew=665)
(1)【探究一:相等的角】
同学们用量角器度量后猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38771f8ad24032d99f4e6bf266aa3b37.png)
(2)【探究二:相等的线段】
如图2所示,组员小亮在(1)的条件上添加了一条线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ca79b19f29de88adfa75f53db428da.png)
解:如图2中,
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dcaeff54dcbc3e7f2fa4f8e8ad964f.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34641a0419992c419e706de2b21b0563.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db609c0ddcb9af21ddbf443d3e527cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
因为______,______,______
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b78ea1175e229ca1a9fc90580bc050d.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ca79b19f29de88adfa75f53db428da.png)
(3)【探究三:全等的三角形】
如图3所示,组员小刚在(2)的条件上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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