七、证明:如果向量组(alpha )_(1),(alpha )_(2),(alpha )_(3)线性无关,则向量组(alpha )_(1),(alpha )_(2),(alpha )_(3)也线性无关。

七、(证明题,须写出关键步骤,本题共8分)证明:如果向量组线性无关,则向量组也线性无关。

参考答案与解析：

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