TM TCH PH^AN T^O'NG QUAT CU'A CAC PHU.O.NG TRNH SAU
95)
Tm tch ph^an t^o'ng quat cu'a cac phu.o.ng trnh sau:
a) −2xydy+ (y2
+x2
)dx= 0HD gia’i:Ta tm du.o..c thu.a s^o tch ph^an
µ(x) = x12
. D - u.a phu.o.ng trnh da~ cho v^e
da.ng vi ph^an toan ph^an. Khi do nghi^e.m t^o'ng quat la
x2
−y2
=Cx.