EJERCICIO 40

1. (m + n)(m + x) 11. (b – c)(y2 + m2)
2. (x2 + 1)(3x – 1) 12. (x + 3)(x2 – 5)
3. (x + y)(a – b) 13. (b – 3m)( 3z – y)
4. (y – 3a)(2y2 – 1) 14. (a2 + 1)(a + 1)
5. (a – 2b)(m – 3n) 15. (1 – 3a2)(2a + 1)
6. (a2 – 3b)(4x – 5y) 16. (3x – 7)(x2 + 1)
7. (m2 – 3n)(z2 +p2) 17. (1 – 4a)(b – 1)
8. (5m + n2)(mn + p2) 18. (3m + 2)(6m2 – 5)
9. (3a – 2b)(y4 + 1) 19. (xz + my)(xy – mz)
10. (2m + 3n)(x4 + 5) 20. (p2t + m2n)(pt 2 + mn2)