作者Highhuman (Ryan)
看板trans_math
标题[考古] 成大99
时间Tue Jul 3 17:32:03 2012
For a differential equation x^2 y" -3xy' +4y = 0,
(a)use z = lnx to transform such an equation into an equation with constant
coefficients
(b)find the general solution of (a) in terms of x.
这题爬文後，还是不懂...
感觉目的好像是利用 z=lnx 把y'和y"换掉而以...
可以麻烦详细说明吗?! @@"
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