1 . 如图,在等腰三角形
中,
,延长
到点
,延长
到点
.
与
的数量关系,并说明理由;
(2)
的平分线交直线
于点
,若
,求
的度数;
(3)点
是
上一点,过点
作
交
于点
,在(
)条件下求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b998ca4f68cd6fe56940ca67692e607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3d9570418b2eebf70c3dc010283460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9667032ec704927b9a3dcd2d73e6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117878cbd8c00f2aabcdf62b487e2dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
您最近一年使用:0次
23-24七年级下·湖北武汉·阶段练习
2 . 有下列四个命题:①开方开不尽的数是无理数;②同位角相等;③0.01是0.1的一个平方根;④无理数和有理数的乘积可能是无理数;⑤
;⑥直线外一点到该直线的所有线段中垂线最短;⑦不相交的两条直线叫做平行线;⑧过一点有且只有一条直线与已知直线垂直.是真命题的命题有 ____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302942f4319f4e7e70ce3d9c6c3cc956.png)
您最近一年使用:0次
3 . 抖空竹是靠四肢巧妙配合完成的运动项目,是我国第一批国家级非物质文化遗产,如图是小颖同学“抖空竹”时的一个瞬间,此时她双手拿的木棍平行(即
),空竹刚好滑动到位置E,此时
,求空竹与绳子形成
的大小( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b795db836337c61a91730bbc8cc676d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 下列命题是真命题的是( )
A.如果两条直线都和第三条直线垂直,那么这两条直线垂直 |
B.如果两条直线都和第三条直线平行,那么这两条直线平行 |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次
5 . 下列命题中,①同位角相等;②对顶角相等;③的算术平方根是
;④若
,则
或1,真命题是( )
A.②④ | B.①②③ | C.③④ | D.①②④ |
您最近一年使用:0次
6 . 回答下列问题:
(1)填空(在括号中注明理由):如图1所示:
,试说明
.
(______________________)
∴
,
(______________________)
∵
(______________________)
∴
(______________________)
(2)如图2所示,
,试说明
.
(1)填空(在括号中注明理由):如图1所示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c92dcd937763cff6e055a3e14391ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22de80da8a2d46b08a5c0f75c87ed36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dc0c42bfc024c1be6c4dd309d49bb9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d55ed798df30cf1d44d59920474ea8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c92dcd937763cff6e055a3e14391ab.png)
(2)如图2所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e672231ec121e6fe99f3dc5f5e642493.png)
您最近一年使用:0次
2024-03-18更新
|
499次组卷
|
5卷引用:河北省保定市易县白马中学2023-2024学年七年级下学期月考数学试题
河北省保定市易县白马中学2023-2024学年七年级下学期月考数学试题广东省佛山市禅城区第三中学2023-2024学年七年级下学期月考数学试题内蒙古自治区乌海市第二中学2022-2023学年七年级下学期期中考试数学试题(已下线)期中押题卷01-【好题汇编】备战2023-2024学年七年级数学下学期期中真题分类汇编(山东专用)天津市北辰区第二学区片2023-2024学年七年级下学期期中数学试题
7 . 如图,在
中,
平分
,过点D作
交CB于点E,过点E作
交
于点F,则可推得
平分
,其推导过程和推理依据如下:
,(已知)
∴
.( )
又∵
,(已知)
∴
, ( )
( )
∴
.(等量代换)
又∵
平分
,(已知)
∴
.( )
∴
.(等量代换)
∴
平分
.(角平分线定义)
请完善以上推导过程和推理依据,并按照顺序将相应内容填写在答题卡指定区域内.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386cda9f96731510d52ec18199e18286.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01fafec714e5764e1961f465793a393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9454959fd953ac3d66f2a325a553f432.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ab46bfb97d97cbb3b56829109d3ac6.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05687465fbe5c1c670cc98f9e8b20d4c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88504784a3def38879c4e46458acfee.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
请完善以上推导过程和推理依据,并按照顺序将相应内容填写在答题卡指定区域内.
您最近一年使用:0次
2024-03-02更新
|
228次组卷
|
3卷引用:河北省廊坊市第二十一中学2023-2024学年七年级下学期月考数学试题
名校
8 . 根据以下素材,探索解决问题.
测量旗杆的高度 | |||
素材1 | 可以利用影子测量旗杆的高度.如右图,光线![]() ![]() ![]() | 说明:小陈同学![]() ![]() ![]() ![]() ![]() | |
素材2 | 可以利用镜子测量旗杆的高度.如右图,小陈同学从镜子![]() ![]() ![]() | ||
素材3 | 可以利用标杆测量旗杆的高度.如右图,点![]() ![]() ![]() ![]() ![]() ![]() | ||
问题解决 | |||
任务1 | 分析测量原理 | 利用素材1说明![]() | |
任务2 | 完善测量数据 | 在素材![]() ![]() ![]() | |
任务3 | 推理计算高度 | 利用素材3求出旗杆的高度. |
您最近一年使用:0次
2024-02-09更新
|
220次组卷
|
3卷引用:福建省福州市台江区福州华伦中学2023-2024学年八年级下学期月考数学试题
9 . 学校进行撑竿跳高比赛,要看横杆
两端到地面的高度
、
是否相同,小明发现
、
在地面上的影子的长度
、
相同,于是他就断定木杆两端到地面的高度相同,他说的对吗?为什么?(提示太阳光线是平行的)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3f982d999937891eec4cb22d62e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/23a0b34e-0b25-45c5-91ff-20f34544f520.png?resizew=219)
您最近一年使用:0次
10 . (1)如图1,
,
平分
,则
的形状是 三角形;
(2)如图2,
平分
,
,
,则
.
(3)如图3,有
中,
是角平分线,
交
于点D.若
,则
.
(4)如图4,在
中,
与
的平分线交于点F,过点F作
,分别交
,
于点D,E.若
,则
的周长为 .
(5)如图,在
中,
cm,
分别是
和
的平分线,且
,
则
的周长是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd77ccdd91fbd630254938b3502d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(3)如图3,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e016997c9ccce980edb56352c5829f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2017472698304997ecace5a374d4daca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(5)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9ea82fbf17dc33c55abb9d460b37be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fecfdc826358d057dd522388c8156965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d0157310b49104bd2f604b4f83ecd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
您最近一年使用:0次