P o(x)(x-a)(x-a) X-a B B B Mx+n ∴ 。(x-b)(x=b x-b t px t q Mx+w Mx+N 2 x t px+ g x+ px+ Rx+ Rx+s Rx+ x2+rxt +rx + s x+rx+s( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1 2 1 1 2 1 1 1 2 2 2 1 2 2 1 1 2 2 1 2 2 2 . P x A A A Q x x a x a x a B B B M x N x b x b x b x p x q M x N M x N x p x q x p x q R x S R x S R x S x rx s x rx s x rx s α α α β β β λ λ λ λ µ µ µ µ − − − − = + + + + − − − + + + + + + − − − + + + + + + + + + + + + + + + + + + + + + + + + + " " " " " " "