HU NAN DA XUE JING PIN KE CHENG 例4:设矩阵 41 03 A B=-11 求乘积AB和BA 4 03 解:A23By2(210 101 AO 高等粤例4: 设矩阵 A , = 2 1 0 1 0 3 B , = − 2 0 1 1 4 1 求乘积 AB 和 BA 解: − = 2 0 1 1 4 1 2 1 0 1 0 3 A 2 3 B 3 2 = 7 3 10 1