ejercicio 92

11. a8+18a4+81.

12. a6-2a3b3+b6.

13. 4x2-12xy+9y2.

14. 9b2-30a2b+25a2.

15. 1+14x2y+49x4y2.

16.1+a10+2a5.

17. 49m6-70am3+25a2n4

18. 100x10-60a4x5y6+9a8y12.

19. 121+198x6+81x12.

20. a2-24am2x2+144m4x4.