微分方程式を解いて下さい(a-z)ydx+(a-z)xdy+xydz=0

(a-z)ydx+(a-z)xdy+xydz=0

(a-z)ydx+(a-z)xdy=0

f=xy=c

(a-z)y=λ(y) λ=(a-z)

xy=λ(g) g=xy/(a-z)

df+f/(a-z)dz=0

f/(z-a)=c

--\u0026gt;

xy=c(z-a)