HU NAN DA XUE JING PIN KE CHENG 03 B 4 2×3 6112 206 注:AB≠BA即矩阵乘法不满足交换律 AO 高等粤                    = − 2 1 0 1 0 3 2 0 1 1 4 1 B 3 2 A 2 3           = − 2 0 6 1 1 3 6 1 12 注：AB  BA 即矩阵乘法不满足交换律