你未学过导数?
d(x^3/3)/dx = 1/3*3x^2 = x^2
相反就是积分过程
d(xy^2)/dx = y^2*dx/dx + x*d(y^2)/dx = y^2 + 2xy*dy/dx = y^2dx + 2xydy
(x^2+y^2)dx+2xydy=0怎么求通解!
你未学过导数?
d(x^3/3)/dx = 1/3*3x^2 = x^2
相反就是积分过程
d(xy^2)/dx = y^2*dx/dx + x*d(y^2)/dx = y^2 + 2xy*dy/dx = y^2dx + 2xydy