0f1(x)-af2(x)=V(x) 即 f(x)-(x)= V()dc+C<6> 5式加上<6式再除2,可得: f(x)=70(m、r y(ada 2a( ) ( ) ( ) 1 2 af x af x = y x ¢ - ¢ 即 + < > - = ò ( ) 6 1 ( ) ( ) 0 1 2 x x d C a f x f x y a a <5>式加上<6>式再除2，可得： 2 ( ) 2 1 ( ) 2 1 ( ) 0 1 C d a f x x x x = + + ò j y a a