TM NGHI^E.M T^O'NG QUAT CU'A CAC PHU.O.NG TRNH SAU

28)

Tm nghi^e.m t^o'ng quat cu'a cac phu.o.ng trnh sau:

^y

⁰

⁼ _4x^2x_{+ 2y}^+y−_{+ 5}^{1 .}HD gia’i:

D - a.t

^{u= 2x+y}

phu.o.ng trnh du.a v^e da.ng

dudx = 5u+ 92u+ 5.

Gia'i phu.o.ng trnh nay ta du.o..c nghi^e.m

^{10u+ 7 ln|5u+ 9|= 25x+C.}

V^a.y nghi^e.m cu'a phu.o.ng trnh da~ cho la

^{10y+ 7 ln|10x+ 5y= 9| −5x=C.}