高数课程妥媒血课件 理工大理>> 推论 (1)D∑f(x)=∑f(x); i=1 (2)[Cf(x)Y=C'(x); (3)ⅢIf1(x)=f1(x)/2(x)…fn(x) i=1 +…+f1(x)/2(x)…fm(x) =∑If(x)k(x) i=1k=1 k≠i Http://www.heut.edu.cn(1) [ ( )] ( ); 1 1   = =  =  n i i n i i f 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    推论