研究如下方程utt-aiuttx-2butxx=-cuxxxx+uxx+β(u2)xx,u(0,t)=u(π,t)=0, t＞0,uxx(0,t)=uxx(π,t)=0, t＞0,u(x,0)=ε2φ(x),ut(x,0)......