) 中图学技术大荸学系 University of Science and Technology of China DEPARTMENT OF MATHEMATICS >高斯消元法: 思首先将4化为上三角阵,再回代求解。 路 (1) 13 12 n 22 00 (3) 000数 学 系 University of Science and Technology of China DEPARTMENT OF MATHEMATICS ➢ 高斯消元法： 思 路 首先将A化为上三角阵，再回代求解 。               n n n n n n n a a a b a a a b a a a b         1 2 21 22 2 2 11 12 1 1 = (1) (1) (1) (1) (1) 11 12 13 1 1 (2) (2) (2) (2) 22 23 2 2 (3) (3) (3) 33 3 3 ( ) ( ) 0 0 0 0 0 0 n n n n n nn n a a a a b a a a b a a b a b                