3h 2h h 1 (x0)=f012+f1 2h h 2h22h (-36+4f1-f2) h h-h h 2h h +J2 2h22h (-f6+f2 2h 3h L2(x2)=f612+f112+2 2h 2h 2h(0-4f1+3/2) E、(x3)f(3(Ey h xo-x,lxo-x )=f((2) 3! 0 3 E2(x) f( 3! (x1-x)(x1-x2) f(2) (3) E 3!2 0 0 2 1 2 2 2 2 2 2 3 ( ) h h f h h f h h L x f - + - - + - ¢ = ( )( ) 3! ( ) ( ) 0 1 0 2 (3) 2 0 x x x x f E x = - - x ( 3 4 ) 2 1 0 1 2 f f f h = - + - 2 1 0 2 1 2 2 2 2 2 ( ) h h f h h h f h h L x f + - - + - ¢ = ( ) 2 1 0 2 f f h = - + 2 2 0 2 1 2 2 2 2 2 3 2 ( ) h h f h h f h h L x f + - ¢ = + ( 4 3 ) 2 1 0 1 2 f f f h = - + ( ) 3 (3) 2 f x h = ( )( ) 3! ( ) ( ) 1 0 1 2 (3) 2 1 x x x x f E x = - - x ( ) 6 (3) 2 f x h = - ( )( ) 3! ( ) ( ) 2 0 2 1 (3) 2 2 x x x x f E x = - - x ( ) 3 (3) 2 f x h =