已知向量组 A : a 1 = (0 , 1 , 2 , 3) T , a 2 = (3 , 0 , 1 , 2) T , a 3 = (2 , 3 , 0 , 1) T ; B : b 1 = (2 , 1 , 1 , 2) T , b 2 = (0 , - 2 , 1 , 1) T , b 3 = (4 , 4 , 1 , 3) T , 证明 B 组能由 A 组线性表示 , 但 A 组不能由 B 组线性表示 .
【简答题】连词成句。 1. I, Ann, needs, think, help, some ___________________________ 2. please, the station, is, where, me, excuse ___________________________ 3. the clothing shop, the post office, next to, is _____...