R1 sll RR R RR R smm 上式的解式为 4之4 i=1,2,…,m 式中 R R21R2 R上式的解式为 11 12 1 1 11 21 22 2 2 22 1 2 m m s m m s m m mm mm smm R R R i v R R R i v R R R i v                   =                   1 1 1,2, , m mi sjj ji j i v i m = =  =   ， 式中 11 12 1 21 22 2 1 2 m m m m mm R R R R R R R R R  =