为自己加油

设A=
(310
-121
342)
，B=
(1-10
2-25
341)
，求(1)AB-BA；(2)B^T•A^T．

(1)AB-BA ( 3 1 0 -1 2 1 3 4 2) ( 1 -1 0 2 -2 5 3 4 1) - (1 -1 0 2 -2 5 3 4 1) (3 1 0 -1 2 1 3 4 2) = (5 -5 5 6 1 11 17 -3 22) - (4 -1 -1 23 18 8 8 15 6) = (1 4 6 -17 -17 3 9 -18 16) (2)B^T•A^T=(AB)^T= (5 -5 5 6 1 11 17 -3 22)^T = (5 6 17 -5 1 -3 5 11 22)