解此线性方程组 s+2 (S+1)Y(s)-sX(s)= (S-1) 2sY(S)-(+1)X(s)= (S-1) s+1 S D -(S+1)2+2S 2 (s+1) 2s-1+2s2=s2-2s-110 解此线性方程组 2 1 2 2 1 ( 1) 2 2 ( 1) 1 ( 1) 1 2 ( ) ( 1) ( ) ( 1) 2 ( 1) ( ) ( ) 2 2 2 2 2 2 2 = - - - + = - - = - + + = - + + - =        - - + = - - - + + - = s s s s s s s s s s s D s s sY s s X s s s s s Y s sX s