1. (x – 2xy – y
2)y’ + y
2 = 0
2. ydx + 2xdy = 2y*(sqrt(x))*(1/cos2y)dy
3. (1 + x2y2)dx + 2x2dy = 0
4. xdy – ydx = sqrt(x2 + y2)dx
5. y” – 8y’ +16y = (1-x)e4x
6. y” – 2y’ = e2x + x2 – 1 thỏa mãn điều kiện: y(0) = 1/8, y’(0) = 1.
7. y” – 5y’ = 3x2 + sin5x
8. y” - 2y’ + y = (ex / x)
9. y.y’ + 1 = (x - 1)e(-y2/2)
10. xy2y’ = x2 + y3
11. 2x(1 + sqrt(x2 – y))dx – sqrt(x2 – y)dy = 0
12. (2x + yexy)dx + (1 + xexy)dy = 0 khi y|x = 0 =1
13. 3xdy = y(1 + xsinx + 3y3sinx)dx.