GIA'I PHU.O.NG TRNH

79)

Gia'i phu.o.ng trnh:

^y

²

^{dx+ (2xy+ 3)dy= 0}HD gia’i: P(x, y) =y

²

, Q(x, y) = 2xy+ 3; ∂P∂y = ∂Q∂x = 2y(1)⇔d(xy

²

+ 3y) = 0

. V^a.y

^xy

²

^{+ 3y=C}