解不等式(组)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9be9c8046105536a24ecbf7a1a0988.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a862d66b29798dcf9ffe5a64df2eefb.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd7db0649bf8026fe88a43a3e0b08ee.png)
(4)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9be9c8046105536a24ecbf7a1a0988.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a862d66b29798dcf9ffe5a64df2eefb.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd7db0649bf8026fe88a43a3e0b08ee.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f43fd3179ba4dbe7a0522503bae0b3b2.png)
23-24七年级上·重庆北碚·期末 查看更多[2]
重庆市北碚区西南大学附属中学校2023-2024学年七年级上学期期末数学试题(已下线)专题2.19+解一元一次不等式(组)100题(提升练1)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2024-01-17 13:00:07
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【推荐1】阅读理解,解决问题.
二阶行列式指4个数组成的符号,其概念起源于方程组,是一个重要的数学工具,不仅在数学中有广泛的应用,在其他学科中也经常用到.我们把
称作二阶行列式,规定它的运算法则为
.如
.请根据上文,解决问题:如果有
,求
的取值范围.
二阶行列式指4个数组成的符号,其概念起源于方程组,是一个重要的数学工具,不仅在数学中有广泛的应用,在其他学科中也经常用到.我们把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29320f184b4027471a2951527457453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9fec025453bac0d34d5e9bdf61a6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca35c907b3f3934aca7942c14cdd05f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b349cde509aaa5c398b516f8893ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】对于有理数a,b,定义
的含义为:当
时,
;当
时,
;
例如:
,
.
(1)
= ;
(2)求
;
(3)已知
,求k的取值范围;
(4)已知
,直接写出m,n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0aa3b53c73db6284e11cb8748ad6d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1132de2e8913dba9c5cc2396ecb09fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e26eda60c49463d7c3e5a42e24d37c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1d1728b70e01a04bd6877372aff860.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88553faf553a990759d578c66c833ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4538adaa096c235b22678feb5c4707.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273f1abbcd597db37806450122721a38.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec9653537370d1dc0ca5b52994adb67.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19452ea0bdc249486b3601ad607431e4.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2227642e8ff5246e07a33f75ee164e.png)
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【推荐1】解不等式(组),并把解集在数轴上表示出来.
(1)10﹣4(x﹣3)≤2(x﹣1);
(2)
.
(1)10﹣4(x﹣3)≤2(x﹣1);
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888da073f719c8ed16b162b98169738.png)
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