求y"=y'/x+x的通解

问题描述:

求y"=y'/x+x的通解

y" = y'/x + x
==> y"/x - y'/x^2 = 1
==> ( y'/x ) ' = 1
==> y'/x = x + C1
==> y' = x^2 + C1x
==> y = x^3/3 + C1 x^2/2 + C2
其中C1、C2为任意常数.