西安毛子科技大枣三XIDIAN UNIVERSITY又对D作初等行变换：i=1,2,...,n.I, =aii'n+1 +ai2'n+2 +... +ain'2n?可得00C11Can00.CnlCnnD=-1brbinbmbnn-1这里C, =aibr, +azb2, +..+anbj, i,j=1,2,.,n.又对D作初等行变换： 1 1 2 2 2 , 1,2, , . i i n i n in n r a r a r a r i n = + + + = + + 可得 11 1 1 11 1 1 0 0 0 0 1 1 n n nn n n nn c c c c D b b b b = − − 这里 1 1 2 2 , , 1,2, , . ij i j i j in nj c a b a b a b i j n = + + + =