(2x+y+1)dx+(x+2y-1)dy=0的通解
问题描述:
(2x+y+1)dx+(x+2y-1)dy=0的通解
答
(2x+1)dx+(2y-1)dy+ydx+xdy=0
d(x^2+x+y^2-y+xy)=0
x^2+x+y^2-y+xy=C