3.判断题设向量beta可由向量组alpha_(1),alpha_(2),alpha_(3),alpha_(4)线性表示，但不能由alpha_(1),alpha_(2),alpha_(3)线性表示。证明：则alpha_(4)不能由alpha_(1),alpha_(2),alpha_(3),beta线性表示.A 对B 错

3.判断题 设向量$\beta$可由向量组$\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}$线性表示，但不能由$\alpha_{1},\alpha_{2},\alpha_{3}$线性表示。证明：则$\alpha_{4}$不能由$\alpha_{1},\alpha_{2},\alpha_{3},\beta$线性表示. A 对 B 错

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