【问题情境】
在综合与实践课上,同学们以“一个含
的之间三角尺和两条平行线”为背景开展数学活动.如图,已知两直线
且
,在三角形
中,
,
,
.
(1)当三角形
和平行线的位置如图1时,若
,求
的度数;
【深入探究】
(2)如图2,在(1)的条件下,∠1的度数不变,创新小组的同学把直线
向上平移,求
的度数;
【拓展应用】
(3)缜密小组在创新小组的基础上,将图形继续变化得到图3,若
平分
,求
的度数.
在综合与实践课上,同学们以“一个含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30361168bea66300f35d8d59b1b55158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966a7257fd3af3a4049844773c611e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2594e927cb7ed022acc039c3bb136d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
(1)当三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe3339c61fed6f92db19ac6db08fd5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
【深入探究】
(2)如图2,在(1)的条件下,∠1的度数不变,创新小组的同学把直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
【拓展应用】
(3)缜密小组在创新小组的基础上,将图形继续变化得到图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48771358b76e240743bb49c497ef7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
23-24七年级下·陕西咸阳·期中 查看更多[2]
陕西省咸阳市永寿县蒿店中学2023-2024学年七年级下学期期中数学试题(已下线)期末押题模拟卷(考试范围:北师大版七下全部内容)-备战2023-2024学年七年级数学下学期期末真题分类汇编(北师大版)
更新时间:2024-05-13 11:35:35
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解答题-证明题
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【推荐1】如图,已知
.
(1)求证:
;
(2)若
平分
,且
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab13468c36f8ee42ab01b2169418ac43.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/750a7f84-c702-4fe3-b647-adca15867779.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b01e1680e767c1236de003bad94648.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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您最近一年使用:0次
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【推荐2】如图1,A、B两点同时从原点O出发,点A以每秒x个单位长度沿x轴的负方向运动,点B以每秒y个单位长度沿y轴的正方向运动.
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977145130778624/2982558853226496/STEM/0a498d5b-f26a-45b6-b33a-13b6a97cc347.png?resizew=224)
(1)若
,试分别求出运动1秒钟时,A、B两点的坐标.
(2)设∠BAO的邻补角和∠ABO的邻补角的平分线相交于点P图2,问:点A、B在运动的过程中,∠P的大小是否会发生变化?若不发生变化,请求出其值;若发生变化,请说明理由.(提示:三角形的内角和等于180°,比如:∠PAB+∠PBA+∠P=180°)
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977145130778624/2982558853226496/STEM/0a498d5b-f26a-45b6-b33a-13b6a97cc347.png?resizew=224)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2af5ba3dd67829f5669a4e01c9b28f.png)
(2)设∠BAO的邻补角和∠ABO的邻补角的平分线相交于点P图2,问:点A、B在运动的过程中,∠P的大小是否会发生变化?若不发生变化,请求出其值;若发生变化,请说明理由.(提示:三角形的内角和等于180°,比如:∠PAB+∠PBA+∠P=180°)
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解答题-证明题
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适中
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【推荐1】如图1,点
是线段
上一点
,分别以
、
为直角边,在
同侧作等腰直角三角形
和
,点
、
分别是斜边
、
的中点,点
是线段
的中点,连接
、
.
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757790118952960/2822801580228608/STEM/a21aa701-0f11-4ec3-b2e2-59d974741431.png)
(1)观察猜想,图1中,线段
与
的数量关系是______,位置关系是______;
(2)探究证明:将图1中的
绕着点
顺时针旋转
,如图2,点
、
、
依然分别是
、
、
的中点,请判断(1)中结论是否成立?若成立,请证明;若不成立,请说明理由.
(3)若将图1中
和
都换成等边三角形,将图1中的
绕着点
顺时针旋转
,如图3,点
、
、
依然分别是
、
、
的中点,请判断(1)中结论是否成立?若成立,请证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://img.xkw.com/dksih/QBM/2021/7/5/2757790118952960/2822801580228608/STEM/a21aa701-0f11-4ec3-b2e2-59d974741431.png)
(1)观察猜想,图1中,线段
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(2)探究证明:将图1中的
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【推荐2】如图,一轮船由B处向C处航行,在B处测得C处在B的北偏东75°方向上,在海岛上的观察所A测得B在A的南偏西30°方向上,C在A的南偏东25°方向.若轮船行驶到C处,那么从C处看A,B两处的视角∠ACB是多少度?
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