(x-x0)6(x-x0)=-6(x-x0) (3)(x6(x-x0)x f(x)d6"(x-x0) f(x)6(x-x0)0--f"(x 6(x-2x)2+(-n2( ) '( ) ( ) 0 0 0 \ x - x d x - x = -d x - x ò ¥ -¥ (3) f (x) '(x - x )dx 0 d ( ) '( ) | [ ''( )] ( ) ''( ) 0 0 0 f x x x f x f x d x x = - - - = - ¥ -¥ ¥ -¥ ò d d ( ) | ( 1) ''( ) ( ) 0 2 0 0 x x f x x x f x - + - - = - ¥ d -¥