1 . 解方程组
,并求使得
的实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9e63b8ffb13fe38a51e6fd57303eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f23be9638a5d5934d0a3c55f3156b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2 . 已知关于
、
的二元一次方程组
的解满足
,求实数
的取值范围.
![](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/73c0bd8836a773dac0ca82c0d0bfe075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d229cbec798c9c278a9b5979cb38247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
3 . 解方程组
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab9d6c02f6b522306930c6dc2cb207f.png)
您最近一年使用:0次
4 . 解方程组
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf93f3c0bf250ba5f8b641d1d8da142.png)
您最近一年使用:0次
5 . 方程组
有无穷多解,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59560eeb90fb855e24fc6e75ff139e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
6 . 方程组
有唯一解,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab3fb9d211a836d91d5db5c9d4be8b6.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c0df903fa1be5d3d3aab55783c3c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab3fb9d211a836d91d5db5c9d4be8b6.png)
您最近一年使用:0次
7 . 若方程组
无解,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ff15c8872c34b760fa9f536c819359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
8 . (1)试探求方程组
有唯一解的充要条件.
(2)由9个正数组成的矩阵
中,每行中的三个数成等差数列,且
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e65f7c16622ec34b1276eb265a6e9bb.png)
、
成等比数列,下列四个判断中,正确的有________ 个.
①第2列
、
、
必成等比数列;②第1列
、
、
不一定成等比数列;③
;④若9个数之和等于9,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ea505f38e24ecc9191265fabea46aa.png)
(2)由9个正数组成的矩阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d537d58c1657629b053368830666779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb9d1aa1cc02e6fe13141ecf5f2549b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e65f7c16622ec34b1276eb265a6e9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee1dc1b0ea35ee824e9e647f46987b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699f39dd97b907f10708e0dc75076f8a.png)
①第2列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e76d1d8e50dda4d50229a8a20c57e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e11a5b70e1e2e685d1783a4707872e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498d357985304a737e7a01272ebbcf15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e84c30444f13d37ada78285dc4f83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc29ee719feeedfbc8c529cf11348abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a555e932cee7a505419ca454e4d1a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b829cb8d1278c92e5976b0ab4716bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56952d18c393108434a65bc835cd7621.png)
您最近一年使用:0次
9 . 用矩阵变换的方法解方程组
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc9ca3c1f6ca2d2f135a78c2ecab659.png)
您最近一年使用:0次
10 . 用矩阵变换的方法解方程
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01421676edf0e9547a8c066f8ce88032.png)
您最近一年使用:0次