[理工] [工數]PDE一題

[MoToBlue (MoToBlue)]

d2y/dt2  = 4 d2y/dx2   for 0<X<3   t>0

y(0,t)=y(3,t)=0 for t>=0

y(x,0)=0 dy/dt(x,0)=x(3-x)   for   0<=x<=3

d表示趴休...

請用如何解...

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