题目内容
设α1=(1+λ，1，1)，α2=(1，1+λ，1)，α3=(1，1，1+λ)，β=(0，λ，λ2)。 ①λ≠-3时，β可用α1，α2，α3线性表示，并且表示方式唯一。 ②λ=0时，β可用口α1，α2，α3线性表示，并且表示方式不唯一。 ③λ=-3时，β不可用α1，α2，α3线性表示。 以上叙述正确的有（）个。
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设α1=(1+a，1，1)，α2=(1，1+b，1)，α3=(1，1，1-b)，a，b满足（）条件时r(α1，α2，α3)=2
设n维向量组α1，α2，α3，α4，β的秩为4，则______正确。
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