设线性方程组为 ) (x)_(1)-3(x)_(2)-(x)_(3)=0 (x)_(1)-4(x)_(2)+a(x)_(3)=b 2(x)_(1)-(x)_(2)+3(x)_(3)=5 .取何值时,方程组无解、有唯一解、有无穷多解? 在有无穷多解时求出其通解。

设线性方程组为,问:、取何值时,方程组无解、

有唯一解、有无穷多解? 在有无穷多解时求出其通解。

参考答案与解析：

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