名校
1 . 如图,四边形
中,
,
的平分线交
于点E,连接
.在以下条件:
①
平分
;
②E为
中点;
③
中选取两个作为题设,另外一个作为结论,组成一个命题.___________ ,结论为___________ .(填序号)
(2)可以组成真命题的个数为___________ .
![](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/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
②E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d5dd999aea55c7cab4641815fa53e0.png)
(2)可以组成真命题的个数为
您最近一年使用:0次
2 . 已知:在四边形
中,
,
,点
是线段
上一点,且
平分
,
平分
,给出下面四个结论:
①
;②
;③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb7a14091372653a3f235f30ed3bc96.png)
上述结论中,所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/ac3ceb98-84e2-4122-be8c-f32bf24fe010.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352772aeefb5645d5ee4ce97f069ae96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c9076bff03fca9d4c205dd78c5600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb7a14091372653a3f235f30ed3bc96.png)
上述结论中,所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/ac3ceb98-84e2-4122-be8c-f32bf24fe010.png?resizew=139)
A.①② | B.③④ | C.①②③ | D.①②③④ |
您最近一年使用:0次
名校
3 . 如图,在
中,
,点E为线段
上一动点,有下列四个结论:
①在E点运动过程中,
的面积始终是
面积的一半;
②在线段
上有且只有一点E,使得
;
③若点E恰好是
的角平分线与
的角平分线的交点,则点E是
的中点;
④若
,则在
上有且只有一点E,使得
是直角三角形其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d45907c3ea211a810bbf941a0bd0e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①在E点运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
②在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b12b02a02a0a373cf442b899ffd66f.png)
③若点E恰好是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
您最近一年使用:0次
2023-07-11更新
|
240次组卷
|
3卷引用:北京市大兴区2022-2023学年八年级下学期期末数学试题
北京市大兴区2022-2023学年八年级下学期期末数学试题北京市东直门中学2023-2024学年八年级下学期期中数学试题(已下线)2023—2024学年名校期末好题汇编(人教版八年级数学下册)——专题三—平行四边形和三角形的中位线
4 . 阅读材料并回答问题.
数学课上,老师提出了如下问题:已知点
在直线
上,
,在同一平面内,过点
作射线
,满足
.当
时,如图1所示,求
的度数.
甲同学:以下是我的解答过程(部分空缺)
解:如图2,∵点O在直线
上,
∴
,
∵
,
∴
,
,
∴
平分
,
∴
,
∵
,
,
∴
.
乙同学:“我认为还有一种情况.”
请完成以下问题:
(1)请将甲同学解答过程中空缺的部分补充完整.
(2)判断乙同学的说法是否正确,若正确,请在图1中画出另一种情况对应的图形,并求
的度数,写出解答过程;若不正确,请说明理由.
(3)将题目中“
”的条件改成“
”,其余条件不变,当
在
到
之间变化时,如图3所示,
为何值时,
成立?请直接写出此时
的值.
数学课上,老师提出了如下问题:已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070dca60e5734051ab087b131936c8de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/42192e75-d08a-4530-92e2-f97dbec03ae1.png?resizew=485)
甲同学:以下是我的解答过程(部分空缺)
解:如图2,∵点O在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df367e658deefd2d19407c0f146e3716.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e613a5e3aec7fa3e340b2158326272e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a113fb8d384f0f821f289783d4c2358e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1009c80f5e73d0b43836e18c21fc3041.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b600f913d6d700bbd332b34220b78a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
乙同学:“我认为还有一种情况.”
请完成以下问题:
(1)请将甲同学解答过程中空缺的部分补充完整.
(2)判断乙同学的说法是否正确,若正确,请在图1中画出另一种情况对应的图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(3)将题目中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1dd3c503ff0b4e68f035709e34bc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbec8352ce3dbfbf3b173045d0ba8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1720ed2ee45e4ccf61d332e0339378ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2023-08-26更新
|
235次组卷
|
11卷引用:北京市通州区2021-2022学年七年级上学期期末数学试题
北京市通州区2021-2022学年七年级上学期期末数学试题贵州省遵义市余庆县2022-2023学年七年级上学期期末数学试题广东省梅州市五华县兴华中学2022-2023学年七年级下学期开学考试数学试题河南省南阳市油田2022-2023学年七年级上学期期末考试数学试题吉林省2023-2024学年七年级上学期期末数学试题吉林省2023-2024学年七年级上学期期末数学试题(已下线)专题4.11 几何图形初步章末八大题型总结(培优篇)-2023-2024学年七年级数学上册举一反三系列(人教版)(已下线)专题4.10 基本平面图形章末九大题型总结(培优篇)-2023-2024学年七年级数学上册举一反三系列(北师大版)(已下线)专题6.10 平面图形的认识(一)章末九大题型总结(培优篇)-2023-2024学年七年级数学上册举一反三系列(苏科版)(已下线)专题6.11 图形的初步认识章末九大题型总结(培优篇)-2023-2024学年七年级数学上册举一反三系列(浙教版)(已下线)专题4.10 直线与角章末九大题型总结(培优篇)-2023-2024学年七年级数学上册举一反三系列(沪科版)
名校
5 . 阅读材料并回答问题:数学课上,老师给出了如下问题:已知,如图1,
,
平分
.若
,请你补全图形,并求
的度数.
解:如图2,作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
因为
,
平分
,
所以
______________,
因为
,
所以
_____________
______________,
同学二说:“符合题目要求的图形还有一种情况.”
请你完成以下问题:
(1)将同学一的解答过程空缺部分补充完整;
(2)判断同学二的说法是否正确,若不正确,请说明理由;若正确,请你在图中画出另一种情况对应的图形,并求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c481ef85b55bb2fce640343c46979f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
解:如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fc14a92f2241b6b12028bc295bd6fe.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c481ef85b55bb2fce640343c46979f.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2785485bc82b8c4412ccb6fe9b1e63ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
同学二说:“符合题目要求的图形还有一种情况.”
请你完成以下问题:
(1)将同学一的解答过程空缺部分补充完整;
(2)判断同学二的说法是否正确,若不正确,请说明理由;若正确,请你在图中画出另一种情况对应的图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
您最近一年使用:0次
2023-02-21更新
|
204次组卷
|
12卷引用:北京市通州区2020-2021学年七年级上学期期末数学试题
北京市通州区2020-2021学年七年级上学期期末数学试题天津市河东区2021-2022学年七年级上学期期末数学试题天津市北辰区2021-2022学年七年级上学期期末数学试题河南省驻马店市汝南县2021-2022学年七年级上学期期末数学试题天津市河东区河东区二号桥中学2021-2022学年七年级上学期期末数学试题河北省石家庄市第四十中学2021-2022学年七年级上学期期末考试数学试题(已下线)专题2.04 线段与角热点技巧提升-2022-2023学年七年级数学上学期期末复习必过知识点及技巧提升(人教版)山东省济南市济南外国语学校2022-2023学年七年级上学期期末数学试题河北省辛集市2022-2023学年七年级上学期期末考试数学试题河南省郑州市第六十九中学2022-2023学年七年级上学期期末数学试题湖南省益阳市赫山区沧水铺镇芙蓉学校2022-2023学年七年级上学期期末数学试题山东省淄博市桓台县2023-2024学年六年级下学期5月期中考试数学试题
6 . 阅读下面材料并回答问题:
数学课上,老师给出了如下问题:如图
,
平分
.若
,
请你补全图形,并求
的度数.
以下是甲同学的解答过程:
解:如图1,
∵
平分
,
,
∴
____________
____________
.
∵
,
∴
____________
.
乙同学说:“我觉得这个题有两种情况,甲同学考虑的是
在
外部的情况,事实上,
还可能在
的内部”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/bc6743d4-8a4c-49f2-82fe-f288161e9e91.png?resizew=350)
请完成以下问题:
(1)请你将甲同学的解答过程补充完整;
(2)判断乙同学的说法是否正确,若正确,请你在图2中画出另一种情况对应的图形,并写出解答过程;若不正确,说明理由;
(3)若将题目
改成
,
平分
.若将
改成
,请直接写出
的度数.
数学课上,老师给出了如下问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e35cf8256272c26989676e3d8b5b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a88b4abc550df428df7f8ecba215d7.png)
请你补全图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
以下是甲同学的解答过程:
解:如图1,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e35cf8256272c26989676e3d8b5b8f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a11c8e6f86cb04a3c98152bdafcea7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecad6cdbd87811e90c95331da8a8eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a88b4abc550df428df7f8ecba215d7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
乙同学说:“我觉得这个题有两种情况,甲同学考虑的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/bc6743d4-8a4c-49f2-82fe-f288161e9e91.png?resizew=350)
请完成以下问题:
(1)请你将甲同学的解答过程补充完整;
(2)判断乙同学的说法是否正确,若正确,请你在图2中画出另一种情况对应的图形,并写出解答过程;若不正确,说明理由;
(3)若将题目
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e35cf8256272c26989676e3d8b5b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d39cbb8d8cd1b9cce1fa56f0ebcc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a88b4abc550df428df7f8ecba215d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10664db62137da518c360f53dbe1f663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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