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: dx+(x*y-y^3)dy=0 >
> >
etoile1987
. y(-1)=0
dx+(x*y-y^3)dy=0
:
y=u*x
dy=xdu+udx
dx+(x^2*u-u^3*x^3)(xdu+udx)=0
(1+x^2*u^2-x^3*u^4)dx+(x^3*u-x^4*u^3)du=0
?
tig81
(etoile1987 @ 15.12.2009, 15:18) *

. y(-1)=0
dx+(x*y-y^3)dy=0
:
y=u*x

?
etoile1987
. ,
wils
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