0 b 11 b 1 2 0 Ax=06 r.n-I 0 0 0 0 n b 11~r+1 In-r"n 今 r1r+1 r,n-r h0 0 0 0 0 0 1 1 0 2 1 1 , 11 1, n r r n r n r x x x b b b b r r r r ,n r n r ,n r n x b x b x x b x b x 1 1 1 11 1 1 Ax 0