对非齐次线性方程组 +a1x+…+a,x.=b 2x2+…+ 十an,2x+…+a X mnn A XX ≠0对非齐次线性方程组 令 11 1 12 2 1 1 21 1 22 2 2 2 1 1 2 2 (1) n n n n m m mn n m a x a x a x b a x a x a x b a x a x a x b  + + + =   + + + =     + + + = 11 12 1 21 22 2 1 2 n n m m mn a a a a a a A a a a     =           n m x b x b x b x b         = =                      1 1 2 2 ， 0