设 a = ( -2 , 4 , -2 ) , b = ( 2 , -7 , 4 ), 则 3 a + 2 b 等于( )
A. 2 ( -1 , -1 , 1 )
B. 2 ( 1 , -1 , -1 )
C .2 ( -1 , 1 , -1 )
D. - 2 ( 1 , 1 , 1 )
设 a = ( -2 , 4 , -2 ) , b = ( 2 , -7 , 4 ), 则 3 a + 2 b 等于( )
A. 2 ( -1 , -1 , 1 )
B. 2 ( 1 , -1 , -1 )
C .2 ( -1 , 1 , -1 )
D. - 2 ( 1 , 1 , 1 )
设 a = (2, 4, 1), b = (-2, 3, -1)则 2a - 3b 等于( )A. (-10,-1,5)B. (10,-1,-5)C. (10,
设 overrightarrow(a) = (2, -3, 2), overrightarrow(b) = (-4, 6, 4), 则 cos(overrigh
(8)己知 =B, 其中-|||-1 2 2 5 -1]-|||-A= 2 4 B= 4 10 -2 ,-|||-3 5 7 9 3-|||-则 = __
设2 -2 -4 2 -3 -5-|||-A= -1 3 4 B= -1 4 5-|||-1 -2 -3 1 -3 -4(1)验证2 -2 -4 2 -3 -5
已知矩阵A= 3 -1 2 ,B= 3 -2B=( ) 2-|||-0 4 1 , -3 -4 0 ,则A= 3 -1 2 ,B= 3 -2B=( )
[单选题]若(a,b)=a2+2b,则(3,4)2+5(2,-7)+1的值为( )。A.245B.240C.239D.234
[问答题]设A为4×4矩阵,B为5×5矩阵,且|A|=2,|B|=-2,则|-||A||B|=,|-||B||A|=----------.
[问答题]设A为4×4矩阵,B为5×5矩阵,且|A|=2,|B|=-2,则|-||A||B|=---------,|-||B||A|=-------------
[问答题]设A为4×4矩阵,B为5×5矩阵,且|A|=2,|B|=-2,则|-||A||B|=------------,|-||B||A|=----------
[单选题]设a=2,b=3,c=4,d=5,则表达式Not a<=c Or 4*c=b^2 And ba+c的值是A.-1B.1C.真D.假