Cu= (i=1,2,,n,jF1,2,,k) (3.17) av2 ym … C12 021 0422 C2m b21 b22 … bak C21 C22 C2k n2 Cn2= = m p ij aip ppj c 1 (i = 1, 2, …, n, j= 1,2, …, k) (3.17)             =                         n n n k k k m m m k k k n n n m m m c c c c c c c c c b b b b b b b b b a a a a a a a a             1 2 2 1 2 2 2 1 1 1 2 1 1 2 2 1 2 2 2 1 1 1 2 1 1 2 2 1 2 2 2 1 1 1 2 1