Gauss顺序消去法(续 第k-1步消元完成后,有 a(}x+a23x2+………+aDxn=b 2x2 (k) (k) 从xk+…+amxn=bk x, +.+ wx=b (k) 设为A()=b( 2004-11-102004-11-10 9 Gauss顺序消去法（续） 第k-1步消元完成后，有   + + = + + = + + = + + + = ( ) ( ) ( ) ( ) ( ) ( ) (2) 2 (2) 2 2 (2) 22 (1) 1 (1) 2 1 (1) 1 12 (1) 11 ... ........................ ... ........................ k n n k k nn k nk k n k k k kn k kk n n n n a x a x b a x a x b a x a x b a x a x a x b LLLL LLLL (k ) (k ) A x br r 设为 =