则方程<1化为: l(,n)=0 50n 2、求通解 选择 5 (x+at) [n=(x-ar 即:x=012X5+n) t=(1/2a)(-m) 0vdn=C1(2)则方程<1>化为： ( , ) 0 2 = ¶ ¶ ¶ x h x h u 2、求通解： 选择 î í ì = - = + ( ) ( ) x at x at h x î í ì = - = + (1/ 2 )( ) (1/ 2)( ) x h x h t a x 即： ò = ¶ ¶ = ¶ ¶ \ 0 ( ) 1 h x h h x x d C u u