如图,
,在线段
的延长线上有一个动点
,连接
,已知
平分
.请问:当点
运动时,
的值是否发生变化?如果不发生变化,求出这个比值;如果发生变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddcd23422af8c85fc962507c89eb729f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4842ff05aaefb2f28c96444f62a98c22.png)
2024七年级·全国·竞赛 查看更多[3]
第十一届 “枫叶新希望杯”全国七年级(A卷)试卷版(已下线)专题8.2 二元一次方程组的相关概念(分层练习)-2023-2024学年七年级数学下册基础知识专项突破讲与练(人教版)(已下线)专题10.2 二元一次方程组(分层练习)-2023-2024学年七年级数学下册基础知识专项突破讲与练(苏科版)
更新时间:2024-02-10 12:48:08
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【推荐1】对于有理数x,y,定义新运算:
,
,其中a,b是常数.例如
,
.
(1)若关于x,y的方程组
的解也满足方程
,求m的值;
(2)若关于x,y的方程组
的解为
,求关于x,y的方程组
的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ddb18d7af72258ae03ac0aa7ce87774.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83425643e023fe61553528ab54d406bf.png)
(1)若关于x,y的方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a1a6036e7fcacc14ee1288f990c10a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d816a6e4a5c6375309040fdda0038b.png)
(2)若关于x,y的方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d908b6679c128d776310ca5cf404a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cea58837a973b19d930ee311a6ed6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59e1923a6303a6c7429e81c18a5617.png)
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【推荐2】某制造厂决定购买A,B两种型号的污水处理设备若干台,其中每台设备的价格、月处理污水量如下表:
(1)若要求购买资金共20万元,则该厂有哪些购买方案?
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A型 | B型 | |
价格(万元/台) | 8 | 6 |
月处理污水量(吨/月) | 200 | 180 |
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解答题-问答题
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【推荐1】如图,点O为直线AB上一点,将一直角三角板OMN的直角顶点放在点O处.射线OC平分∠MOB.
(1)如图1,若∠AOM=30°,求∠CON的度数;
(2)将图1中的直角三角板OMN绕顶点O顺时针旋转至图2的位置,一边OM在射线OB上方,另一边ON在直线AB的下方.
①探究∠AOM和∠CON之间的数量关系,并说明理由;
②当∠AOC=3∠BON时,求∠AOM的度数.
(1)如图1,若∠AOM=30°,求∠CON的度数;
(2)将图1中的直角三角板OMN绕顶点O顺时针旋转至图2的位置,一边OM在射线OB上方,另一边ON在直线AB的下方.
①探究∠AOM和∠CON之间的数量关系,并说明理由;
②当∠AOC=3∠BON时,求∠AOM的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/be9bcfcd-cadd-4d58-835c-ee59715f717c.png?resizew=319)
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解答题-问答题
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适中
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【推荐2】点O为直线
上一点,在直线AB上侧任作一个
,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/5e88d371-7ea8-48c5-abe3-93e6fb51df20.png?resizew=441)
(1)如图1,过点O作射线,当
恰好为
的角平分线时,请求出
与
之间的倍数关系,
(2)如图2,过点O作射线
,当
恰好为
的角平分线时,另作射线
,使得
平分
,求
的度数;
(3)在(2)的条件下,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)如图1,过点O作射线,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
(2)如图2,过点O作射线
![](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/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b161eeed84fff7505741e8bb24a30191.png)
(3)在(2)的条件下,若
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【推荐1】如图,直线
、
相交于点O,
,垂足为O,
,求
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解答题-证明题
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【推荐2】完成下面推理填空:
如图,E、F分别在
和
上,
,
与
互余,
于G.
求证:
.
证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/163e2eb13b42eb3d675ba133b96fff40.png)
(______)
(已知)
______
______(______)
(______)
(平角的定义)
.
与
互余(已知)
(互余的定义)
(______)
(内错角相等,两直线平行)
如图,E、F分别在
![](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/8efa4e9eebe76c572fbac1522085868b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/28580a5b-2bb3-4e1d-b84c-03994b8018f0.jpg?resizew=167)
证明:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b96de1f1e955ecfe026fb2309ade583.png)
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