1 . 综合与实践
教材重现:取一块质地均匀的三角形木板,用一枚铁钉顶在这个三角形的重心上,木板会保持平衡(如图),这是重心的物理性质.
,如图,
,
.为了找到重心,以便像教材上那样稳稳用笔尖顶起,她先把点
与点
重叠对折,得折痕
,展开后,她把点
与点
重叠对折,得折痕
,再展开后连接
,交折痕
于点
,则点
就是
的重心.
,判断
与
的数量关系并说明理由;
(2)猜想验证:莹莹通过测量发现
与
,
与
有同样的数量关系,写出它们的关系并说明理由;
(3)尝试运用:利用(2)的结论计算
的面积;
(4)拓展探究:莹莹把
剪下后得
,发现可以与
拼成四边形,且拼的过程中点
不与点
重合,直接写出拼成四边形时
的长.
教材重现:取一块质地均匀的三角形木板,用一枚铁钉顶在这个三角形的重心上,木板会保持平衡(如图),这是重心的物理性质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)猜想验证:莹莹通过测量发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(3)尝试运用:利用(2)的结论计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(4)拓展探究:莹莹把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f1c441692afc8ec307b8a563cafef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fce10478485ef01d2318fc3465bb4e.png)
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2024-06-13更新
|
132次组卷
|
3卷引用: 2024年山东省聊城临清市中考二模数学试题
2 . 综合与实践
【提出问题】
在一次数学活动课上,老师提出这样一个问题:如图,正方形
中,点
是射线
上的一个动点,过点
作
交正方形的外角
的平分线于点
.求证:
.
在边
上时,小明的证明思路如下:
在
上截取
,连接
.
则易得
,
,______.
.
.
补全小明的证明思路,横线处应填______.
【深入探究】
(2)如图2,在(1)基础上,过点
作
交直线
于点
.以
为斜边向右作等腰直角三角形
,点
在射线
上.求证:
;
【拓展应用】
(3)过点
作
交直线
于点
.以
为斜边向右作等腰直角三角形
,点
在射线
上.当
,
时,请求出线段
的长.
【提出问题】
在一次数学活动课上,老师提出这样一个问题:如图,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813507ac13ded6b8941b664fbd379fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b5d4c7feb93c8ee84f1b3c39f73ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
则易得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81687b4fa1795755b75c0644bdd3fc09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c75a7c3456584754c8a52ddc5bb9a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e83c1234e90b0d2ef60296dc369efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8032d724d3fd498bc7aec233d71899b.png)
补全小明的证明思路,横线处应填______.
【深入探究】
(2)如图2,在(1)基础上,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7baeb8f9a161f2822e5cdb51aed3e1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ccb46ed82725253ab3cb381664047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e29770dc2db6536f6570f44ef5152.png)
【拓展应用】
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7baeb8f9a161f2822e5cdb51aed3e1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ccb46ed82725253ab3cb381664047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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3 . 综合与实践:
函数复习课后,数学兴趣小组的同学们对函数
的图象与性质进行探究,过程如下.请完成探究过程:
(1)初步感知:函数
的自变量取值范围是__________;
(2)作出图象
①列表:
填空:表中
__________,
__________;
②描点,连线:在平面直角坐标系
中,描出以上表中各对对应值为坐标的点,并根据描出的点,可画出该函数的图象如下所示;
小明观察图象,发现这个图象为双曲线,结合反比例函数的知识,小明将函数
转化为
,他判断该函数图象就是反比例函数
通过某种平移转化而来.已知反比例函数
是中心对称图形,对称中心为
,结合小明的分析,可知函数
的对称中心为
__________;
(4)拓展应用
已知当
时,关于
的方程
有实数解,请直接写出k的取值范围是__________.
函数复习课后,数学兴趣小组的同学们对函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fd3461a4efa35563dd4e58f3f35b9.png)
(1)初步感知:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fd3461a4efa35563dd4e58f3f35b9.png)
(2)作出图象
①列表:
x | … | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | 0 | 1 | 2 | 3 | … |
y | … | ![]() | ![]() | 2 | 3 | 4 | m | 6 | ![]() | ![]() | ![]() | ![]() | 0 | ![]() | ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
②描点,连线:在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
小明观察图象,发现这个图象为双曲线,结合反比例函数的知识,小明将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fd3461a4efa35563dd4e58f3f35b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905bb5be942f3aa3667e5ce1c264c02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25b4f23770747042d68b0fa011762258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25b4f23770747042d68b0fa011762258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6a9ffffc0c461881b427c543924cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fd3461a4efa35563dd4e58f3f35b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(4)拓展应用
已知当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6ad6387d592102a743742620eee7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2b7a3f6812352d127a47f9fcad4b6d.png)
您最近一年使用:0次
4 . 如图1,将两个完全相同的三角形纸片
和
重合放置,其中
,
.
如图2,固定
,使
绕点C旋转,当点D恰好落在
边上时,填空:
①线段
与
的位置关系是 ;
②设
的面积为
,
的面积为
,则
与
的数量关系是 .
(2)猜想论证
当
绕点C旋转到如图3所示的位置时,小明猜想(1)中
与
的数量关系仍然成立,并尝试分别作出了
和
中
边上的高,请你证明小明的猜想.
(3)拓展探究
已知
,点D是角平分线上一点,
,
交
于点E(如图4).若在射线
上存在点F,使
,请直接写出相应的
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fbc42ea04e6ae3b868f218785c9bed.png)
如图2,固定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(2)猜想论证
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a94b8f7a76abc144f6e695650be1a27.png)
(3)拓展探究
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d554d7f339e6f8712534d59ba2a63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851b071099ba4a1dc0b3e1b86d9e27ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
5 . 在学习完七年级下册第五章《相交线与平行线》后,同学们对平行线产生了浓厚的兴趣,张老师围绕平行线这一节在班级内开展了一个课题学习活动:探究平行线的“等角转化”功能.
(1)观察发现:在小学我们曾剪下三角形的两个内角,将它们与第三个内角拼在一起,发现三个内角恰好拼成了一个平角.
问题1:请同学们尝试用说理的方式证明该结论正确.
聪明的小明同学给出如下解答,请补全证明过程.
,
,
是
的三个内角, 过点A作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
∵
(已知)
∴
(理由: ① )
∵
(理由: ② ),
∴
(理由: ③ )
(2)拓展探究:听完小明的说理过程后,善于思考的小亮同学提出:小明作辅助线的方法,就是借助平行线把三角形的三个内角转化成一个平角,这就启发我们构造平行线能起到转移角的作用.
对于问题1,小亮还有其他证明方法:如图2所示,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6006fd294aa7a9cdd66907d2637a2baf.png)
是
的三个内角, 延长
到E, 过点B作
.请你按照小亮同学的解答思路证明
.
(1)观察发现:在小学我们曾剪下三角形的两个内角,将它们与第三个内角拼在一起,发现三个内角恰好拼成了一个平角.
问题1:请同学们尝试用说理的方式证明该结论正确.
聪明的小明同学给出如下解答,请补全证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6e767e1162db477c4c0a674cc5fe39.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feefa6f1b88cfe453a531a93302af360.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9253ab75b84e9ba2f6fcc5b545bea02f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8ee8e3a10ea554320bf3fd3263185d.png)
(2)拓展探究:听完小明的说理过程后,善于思考的小亮同学提出:小明作辅助线的方法,就是借助平行线把三角形的三个内角转化成一个平角,这就启发我们构造平行线能起到转移角的作用.
对于问题1,小亮还有其他证明方法:如图2所示,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6006fd294aa7a9cdd66907d2637a2baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da53ee69f216c24a0aeafb8f7419cbc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f572de8798c6eb993ede7606cf7402e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c54067e47b0d69ba6cd85a975df432.png)
您最近一年使用:0次
6 . 定义:如图1,在平面直角坐标系中,点
是平面内任意一点(坐标轴上的点除外),过点
分别作
轴、
轴的垂线,若由点
、原点
、两个垂足
、
线为顶点的矩形
的周长与面积的数值相等时,则称点
是平面直角坐标系中的“美好点”,即
.
点
______ “美好点”(填“是”或“不是”);
(2)【深入探究】:
若“美好点”![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14719c59e7e6e46e08c15a7f7a1e8e9e.png)
在双曲线
(
,且
为常数)上,求
的值;
(3)【拓展延伸】:
在(2)的条件下,
在双曲线
上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ee82573986d4fa6a7ee1b5f397edae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113db8d08a3ca21609b34f70bda57f95.png)
点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e91b5ce2d68f9d0fb56eefae0c3dcf6.png)
(2)【深入探究】:
若“美好点”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14719c59e7e6e46e08c15a7f7a1e8e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047f9964f0f8c23cc543ff7fe89ee8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)【拓展延伸】:
在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af2180c1ebafaddb31274d528acec5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aee0c96f4f9301f1f2823060c0f0074.png)
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7 . 【问题提出】
在数学兴趣小组的研讨中,小明提出自己遇到的问题:解不等式
.
【问题探究】
数学老师启发小明尝试从“函数图象”的角度解决这个问题:
如图1,在平面直角坐标系中,分别画出函数
和函数
的图象,从函数角x度看,解不等式
相当于求双曲线
在抛物线
上方的点的横坐标的取值范围.
的解集为______.
【类比探究】
(2)受此启发,小明尝试解不等式
.经过分析,小明发现需要借助函数
和函数______的图象来求解.请在图2中画出相应的函数图象,并得出不等式
的解集为______.
【拓展应用】
(3)小明想借助函数图象进一步研究不等式,于是尝试解不等式组
,并进行了一些准备,如图3所示.请根据小明的思路分析,直接写出该不等式组的解集______.
在数学兴趣小组的研讨中,小明提出自己遇到的问题:解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22111a0d5ae443e8698cfb9d6a31d95.png)
【问题探究】
数学老师启发小明尝试从“函数图象”的角度解决这个问题:
如图1,在平面直角坐标系中,分别画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22111a0d5ae443e8698cfb9d6a31d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22111a0d5ae443e8698cfb9d6a31d95.png)
【类比探究】
(2)受此启发,小明尝试解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f33e93287dfb8996247c0aef587ad13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f33e93287dfb8996247c0aef587ad13.png)
【拓展应用】
(3)小明想借助函数图象进一步研究不等式,于是尝试解不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0801989dcd3d03ce110ba1df0e2fdf.png)
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8 . 【知识生成】:
通常情况下,通过用两种不同的方法计算同一个图形的面积,可以得到一个恒等式图①,从边长为
的长方形中剪掉一个边长为
的小正方形,将阴影部分沿虚线剪开:拼成图②的长方形.(用字母
表示).
如图3大正方形的面积有两种表示方法可以说明公式: .
【问题探究】:
(2)①已知
,
,则
的值为 .
②如图 3,已知
,
,求
的值.
【拓展计算】:
(3)
通常情况下,通过用两种不同的方法计算同一个图形的面积,可以得到一个恒等式图①,从边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9a340286faf644ce62e8f342dfaadb.png)
如图3大正方形的面积有两种表示方法可以说明公式: .
【问题探究】:
(2)①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bc03651f597b676bc0094448454ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41103daa69ad150f0b4c1fd1e67cda21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5017682a95e9ade5d1b132ec1b0b01df.png)
②如图 3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8792eaab0b6464e5d07436c64aa751a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d7f6e2753370e1616762a84f6aa759.png)
【拓展计算】:
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1cef731bb577f667c0270cbb7d01a5.png)
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9 . 综合与探究:“两条平行线被第三条直线所截”是平行线中的一个重要的“基本图形”,与平行线有关的角都存在着这个“基本图形”,当发现题目的图形“不完整”时,要适当添加平行线将其补充完整.把“非基本图形”转化为“基本图形”,这体现了数学中的转化思想.有这样一个问题:
如图:
,点
、
分别在直线
、
上,点
是
、
之间的一个动点.
在线段
左侧时,请写出
、
、
之间的数量关系,并说明理由.
(2)【问题迁移】如图②,当点
在线段
右侧时,请写出
、
、
之间的数量关系,并说明理由.
(3)【联想拓展】若
、
的平分线交于点
,且
,则
______.
如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/dad2a36927223bd70f426ba06aea4b45.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
(2)【问题迁移】如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
(3)【联想拓展】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd82c51c8a9c1dd494cbb1d9c5411719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d5b88cdac96fd5aeb53283673fafe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92071d27d5da51dd4c40252e657b50d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93591dcef47174fa86cf2a3b8f26ea53.png)
您最近一年使用:0次
10 . 综合与实践
【问题情境】
在“综合与实践”课上,老师提出如下问题:如图1,
是线段
上的一点,以
和
为直角边分别作等腰直角
和等腰直角
,点
在边
边上,连接
和
.
(1)试判断
和
的位置关系,并说明理由.
【实践探究】
(2)“勤学小组”受此问题启发,将图
中的
绕着点
逆时针旋转角度
,使得点
落在
的外部,得到
,点
的对应点为
,点
的对应点为
,连接
,
,如图
,请判断
与
之间的位置关系,并加以证明.
【拓展探究】
(3)“志远小组”在“勤学小组”探究的基础上,提出了这样一个问题:如图3,在:
中,
D 为
内一点,当
,
,
时,求线段
的长.
【问题情境】
在“综合与实践”课上,老师提出如下问题:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【实践探究】
(2)“勤学小组”受此问题启发,将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7199ded47c047792b3147c25467359c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240ee6902d209dfd156f4ae98e59c077.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
【拓展探究】
(3)“志远小组”在“勤学小组”探究的基础上,提出了这样一个问题:如图3,在:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4b9c2e54e6e39f91621075df37141b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cdefec9c63d5754a2b73a232698c523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18834f4ba51bf4d490f35ed02379fec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d45262f98c4965c645062c08cfd675f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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2024-05-27更新
|
133次组卷
|
2卷引用:2024年山东省济南市历城区中考二模数学试题