3定解 t=0)=∑(+D)(kp)42=(-21) C=1,D=0 u, (p,p, t=0)=2 Jo(hi p)akn b,=0 Bn,=0 p-)0(k0)p)p Pa-P2Vo(ki p)adp= Jo(k p)odp-aS Jo(ko)p)p'dp o J(x)xdx x0) (0)2 (0)4 lo do(rdx P334结果 x(0) (0)2 J1(x)x on h(04p2LrJ1-2x2J,1=go 2103.定解 2 0 0 2 (0) 0 1 u( , ,t 0) (C D )J (kn )An (1 )u n     = = +   = −  = C =1, D = 0 ( , , 0) ( ) 0 (0) (0) 0 1 = =  =  = n n n n ut   t J k  ak B Bn = 0         J k d J k u A n n n (1 ) ( ) ( ) 2 (0) 0 0 2 0 2 2 0 (0) 1 2 0 0 0  = −                J kn d J kn d J kn d (0) 3 0 0 2 0 (0) 0 0 (0) 0 0 2 0 2 ( ) 1 (1 ) ( ) ( ) 0 0 0    − = − J x x dx k J x xdx k n n x n x n 3 0 0 2 0 0 (0)4 0 (0)2 ( ) 1 ( ) 1 (0) (0)   = −  (0) (0) 2 0 2 1 3 2 0 (0)2 1 0 (0)4 [ 2 ] 1 ( ) 1 n n x n x n x J x J k J x x k = − −  P334结果