系数矩阵与常数项 C1C12C13 02 (2) (2 (n) 00 (3) b 计算出Am),bm)的过程称消去过程。(1) (1) (1) (1) (1) 11 12 13 1 1 (2) (2) (2) (2) 22 23 2 2 ( ) (n) (3) (3) (3) 33 3 3 ( ) ( ) 0 0 0 0 0 0 b n n n n n n nn n a a a a b a a a b A a a b a b                 = =                     ， 系数矩阵与常数项： 计算出 A ( n ) ， b ( n ) 的过程称消去过程