(t+1)+a(t-1)* (t+1) e(+"l(r+1)dz+ du(t-1) ke (z+1 (z+1)d =e(tdr+(t-1)*e(todt 1+e(xdz=1+(1-e-)u(t) 淮意:1米e (t+1) (t+1)≠e(+l(t+1)1 1 (1 ) ( ) ( 1) ( 1) ( 1) ( 1) 1* ( 1) ( 1) ( 1) 1 1 ( 1) 1 ( 1) 1 ( 1) ( 1) ( 1) ( 1) ( 1) e d e u t e d t e d e u d dt du t e u d e u t u t e u t t t t t t t = : 1 ( 1) ( 1) ( 1) ( 1) e u t e u t 注意 t t