TM NGHI^E.M T^O'NG QUAT CU'A PHU.O.NG TRNH VI PH^AN

125)

Tm nghi^e.m t^o'ng quat cu'a phu.o.ng trnh vi ph^an:

(x+e

x

y

)dx+e

x

y

(1−xy)dy= 0.HD gia’i:

Phu.o.ng trnh vi ph^an toan ph^an co tch ph^an t^o'ng quat;

x

2

2 +ye

x

y

=C

.