& S 1,如 8 q q 83a3 q g/ 3183 8132÷4/;3 8/·4/9 i i ,i i ,i i , q i i q,i q ,i q ,i q n 5, i 1, 4 3 g 2 4 2 g 3 4 g 4 g1 4 g1 4 g1 3 g 2 2 g 4 g 3 g 5 g 1 g 1 = = =  = = = = = 若 = 且 = 则