2+(y-1)M2 (y+1)M2 P=1+27(M2 (8.65) p1 y+ P2‖2 (866) n八P2 1+,(M12-1) 2+(-1)M y+1 (y+1)M2(867)      + + − = − − 2 1 2 2 1 1 1 2 1 ( 1) 2 ( 1) 1 M M M p p p    ( 1) 1 2 1 2 1 1 2 − + = + M p p                   = 2 1 1 2 1 2   p p T T 2 1 2 2 1 1 1 2 1 2 ( 1) 2 ( 1) ( 1) 1 2 1 M M M h h T T + + −       − + = = +     (8.65) (8.64) (8.66) (8.67)