作者winer8 (快来明星3 缺1 )
看板Grad-ProbAsk
标题[理工] [工数]-常系数ode
时间Mon Aug 3 17:39:50 2009
let y1(x) and y2(x) be two solutions of
y''(x)+p(x)y'(x)+q(x)y(x)=0
y(0)=1
then
(1)y1(x)+y2(x)is also a solution
(2)y1(x)*y2(x) is a solution
(3)y1(x)/y2(x) is also a solution
(4)none
ANS:4
我想知道的是变系数ode解相乘不是解是因为微分次序不同 答案不同
那相加不行是为什麽?
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1F：推 yimao:因为要考虑IC..y1(0)+y2(0)=2 08/03 19:04