【简答题】确定常数a,使向量组α1=(1,1,a),α2=(1,a,1),α3一(a,1,1)可由向量组β1=(1,1,a)。β2=(-2,a,4),β2=(-2,a,a)线性表示,但向量组β1,β2,β3不能由向量组α1,α2,α3线性表示.
【单选题】Flanking rudders effect a vessel’s heading because of the().
A.
Effect of the propeller flow on the rudders
B.
Water flow due to the vessel's movement through the water
C.
Tunnel affect of the water flow past opposing rudders
D.
Discharge current being channeled to impinge on the vessel's deadwood
【简答题】设β 1 =α 1 ,β 2 =α 1 +α 2 ,…,β 2 =α 1 +α 2 +…+α m 且向量组α 1 ,α 2 ,…,α m 线性无关,证明向量组β 1 ,β 2 ,…,β m 线性无关.
【多选题】下列画家中,在人物速写方面有卓越成就的画家有
【多选题】金属加工设备对金属进行加工的方式有( )。
【简答题】设向量组 α 1 ,α 2 ,…,α s 线性无关 (1) β 1 ,β 2 ,…,β s 线性无关 (2) 且向量组(2)能被向量组(1)线性表示。求证:向量组(1)能被向量组(2)线性表示。
【简答题】设有向量组(I):α1=(1,0,2)T,α2=(1,1,3)T,α1=(1,-1,a+2)T和向量组(II): β1=(1,2,a+3)T,β2=(2,1,a+6)T,β3=(2,1,a+4)T.试问:当a为何值时,向量组(I)与(II)等价?当以为何值时,向量组(I)与(Ⅱ)不等价?
【单选题】Flanking rudders effect a vessel’s heading because of the ______.
A.
effect of the propeller flow on the rudders
B.
water flow due to the vessel’s movement through the water
C.
tunnel affect of the water flow past opposing rudders
D.
discharge current being channeled to impinge on the vessel’s deadwood