1、想必那个表示的是指数的意思所以4x^3dx-4y^3dy=-4ydx-4xdy，有dy/dx=(x^3+y)/(y^3-x)2、sinxdy+ycosxdx-(dx-dy)sin(x-y)=0推出dy/dx=(sin(x-y)-ycosx)/(sinx+sin(x-y))。希望有帮助
