... x 2u' u=10x3 u'+2xu= 20x2 可得通解為: ux =e 2xdx e2xdx .20x2dx+c = 1 x2[4x5+c] = 4x3 +cx2 1 yx = (u (x)) 4 例題10:Solvey'siny+sinxcosy=sinx 【中山電機】 ...
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