The image you uploaded contains a set of math problems in Vietnamese. Here's a summary of the tasks based on your image:

1. Perform the following calculations:

a) $(2x - y)(4x^2 - 2xy + y^2)$

b) $(6x^5y^2 - 9x^4y^3 + 15x^3y^4): 3x^3y^2$

c) $(2x^3 - 21x^2 + 67x - 60): (x - 5)$

d) $(x^4 + 2x^3 + x - 25): (x^2 + 5)$

e) $(27x^3 - 8): (6x + 9x^2 + 4)$

Let me know if you'd like me to solve any of these or provide detailed steps for any of them!