推论 中()②(x=∑fx; i=1 i=1 (2) Cf(r=c(r) 庄(3)m(o)=f(x)(x)-f(x) i=1 +…+f1(x)f2(x)…fm(x) =∑Ⅱf(x)/(x); i=1k=1 ≠i 上页推论 (1) [ ( )] ( ); 1 1   = =  =  n i i n i fi x f x (2) [Cf (x)] = Cf (x); ( ) ( ); ( ) ( ) ( ) (3) [ ( )] ( ) ( ) ( ) 1 1 1 2 1 2 1 =    + +     = =  = = n i n k i k i k n n n i i f x f x f x f x f x f x f x f x f x   