[工數] 請教這兩題該怎麼算

[Soxx (Soxx)]

1. Solve ODE by inverse differential operator

  (D+1)(D-2)(D-3)y = e^(3x)


2. Solve ODE by down grade integration

   y"-4y'+4y=e^(2x)


  請教大家這兩題的解法  感謝!!

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