1 . 利用行列式解方程组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa47b79d040109ffeffbb92945434cf0.png)
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2 . 展开并化简下列行列式:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35fa49e35a06175948b06f96891523.png)
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3 . 已知
.求证:
三点共线的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39d023fc87895b0f26477e890074e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7358ff8d99126de46113bb1c1c50f726.png)
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4 . 已知矩阵
,定义其转置矩阵
.若
,写出A的转置矩阵
,并求行列式
与
.说明两者有什么关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8557b8dc9f2f6e3ca35d0a3cab09163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d752fefe78383a588d4392b9a6f45f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94f2c3124b7cb5d13997be34e586e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4978089eb165d2241a35275396794d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3306dd450af7eccb7aadaa0bc4303666.png)
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5 . 关于
的二元一次方程组
有唯一一组正解,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d5a63d9eb8d39a50f193b6ebebb296.png)
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6 . 用矩阵变换的方法解方程组:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28dca9584b8698d51af4b3663748decb.png)
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7 . 已知矩阵
,
,
,计算:
(1)
;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310cb16b06b551cb79b801193650eeef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f3e086c56b08a30b1165c1091d9ab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8218236dd2b58f16d299e1e339cd19fe.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2e0881dea2b5d4938ac48b2b1782d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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8 . 甲、乙、丙三人一起做一批零件,甲、乙两人合作,甲做8天乙做5天能够完成;甲、丙两人合作,甲做6天丙做9天能够完成;乙、丙两人合作,乙做10天丙做6天能够完成,那么甲、乙、丙单独做,各需多少天能够完成?
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9 . 求关于
的方程组:
有唯一解的条件,并求在此条件下该方程组的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e43d36ad6b3726431ebcfbebad17a2.png)
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10 . 利用行列式解下列方程组:
(1)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb3514b340beb8f80f777434fe44dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df433e7619c87cc589af5466630fd360.png)
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