;=∑l;i=1,2,…,n A=(k1B1,k21+k2262,…,∑n ku k 21 n =(B1,B2,…Bn 22 2 00 nn URa k i n i j i i j j 1, 2, , 1 =  =  =  ( , , , ) 1 1 1 1 2 1 1 2 2 2  = = + n j A k  k  k   knj  j             = n n n n n k k k k k k         0 0 0 ( , , ) 22 2 11 21 1 1  2  = U1 R