例 x1≤x≤x2 y(x) q(x)=0 0 解 (x,D)=v(5d w(5X5- y(5 2 Iv(sds y(ss Ods 0 <x<x 平(x)= 2aJ(55= d5+voIds]=y 2a x>x2 p(x) (M=[5+vJw5+」 y( 2a 2例      = x x x x x x x x 1 2 0 1 2 0 , ( )   ( x ) = 0 解 ：         d a d a d a u x t x at x at x at x at   −− +− +− = = − ( ) 21 ( ) 21 ( ) 21 ( , )   d a x x−  = ( ) 21 ( ) 1 x  x    d a d a x x x   − −  = = 0 21 ( ) 21 ( ) 1 2 x  x  x 2 x  x [ 0 1 ] 21 ( ) 21 ( ) 1 1    d  0 d a d a x xx x x     = = + − − [ 0 1 0 ] 21 ( ) 21 ( ) 2 21 1    d  0 d d a d a x xx xx x x      = = + + − − 1 x 2 x x (x) 0 = 0 ( ) 2 1 0 x x a = −  ( ) 2 2 1 0 x x a = − 