记E(C12C2 )=∑m2=∑[y-f(x) i=1 =∑[y-∑c0,(x) E实际上是c,C1,…,cn的多元函 数,在E的极值点应有 dE 0,j=0,…,n C 记bk=∑q1,g=∑9my记 E 实际上是 c0 , c1 , …, cn 的多元函 数,在 E 的极值点应有 0 , 0, ... , j E j n c = = 2 2 1 2 1 1 2 1 1 ( , ,..., ) [ ( )] [ ( )] m m n i i i i i m n i j j i i j E c c c y f x y c x = = = = = = − = − 1 1 , m m jk ji ki ji i i i b g y = = 记 = =