作者cccoco (危机感)
看板Grad-ProbAsk
标题[理工] [工数]-ode
时间Tue Feb 9 21:32:13 2010
题目
y"+y=xe^x
a) Find all the solutions
b)please explain why the set of solutions you found in part (a) actually
contains all the solutions.
请问b小题要怎麽写呀..-.-
谢谢
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◆ From: 125.230.124.122
1F:推 shinyhaung:待定系数法? 02/09 21:34
2F:推 ytyty:a的话应该没问题~通解y=c_1cosx+c_2sinx+(1/2)xe^x-(1/2)e^x 02/09 21:40
3F:→ ytyty:b)的话...是把a)的解代进去?? 02/09 21:40
4F:→ cccoco:a小题我OK@@ 可是b小题就不知道该怎麽写了.囧 02/09 21:41