4.设向量组 (alpha )_(1)=(({a)_(11),(a)_(21),(a)_(31))}^r ,_(2)=(({a)_(12),(a)_(22),(a)_(32)) _(3)=-|||-(a13,a23,a33)T。向量组 (beta )_(1)=(({a)_(11),(a)_(21),(a)_(31),(a)_(41))}^r (beta )_(2)=((a)_(12),(a)_(22),-|||-_(32),(a)_(42))}^T, (beta )_(3)=(({a)_(13),(a)_(23),(a)_(33),(a)_(43)) 则有 () 。-|||-(1)若α1,a2,α3线性相关,则β1,β2,β3也线性相关-|||-(2)若α1,α2,α 3线性无关,则β1,β22,β3也线性无关-|||-(3)若β1,β2,β3线性无关,则a1,α2,a3也线性无关-|||-(4)若α1,α2,α 3线性无关的充分必要条件是β1,β2,β3线-|||-性无关