给定线性方程组 ) (x)_(1)+(x)_(2)+(x)_(3)=a-3 (x)_(1)+a(x)_(2)+(x)_(3)=-2 (x)_(1)+(x)_(2)+a(x)_(3)=-2 .(1)问a为何值时,方程组有无穷多个解;(2)当方程组有无穷多个解时,求出其通解(要求用它的一个特解和导出组的基础解系表示).

给定线性方程组

(1)问a为何值时,方程组有无穷多个解;

(2)当方程组有无穷多个解时,求出其通解(要求用它的一个特解和导出组的基础解

系表示).

参考答案与解析：

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