8. (5x – 6)(6 + 5x)
9. (7y+8)(8 – 7y)
10. (9q- 10p)(9q +10p)
11. (12r +13s)(13s – 12r)
11. (0,1 - x)(0,1 + х)
12. (0,2 + у)(0,2 – у)
13. (0,3 – а)(а + 0,3)
14. (в2 + 0,4)(в2 – 0,4)
15. (0,5х 2+ 0,6у)(0,5х2 – 0,6у)
16. (0,7а 3 – 1,2в)(1,2в + 0,7а3 )
17. (1,3 х + 1,4у4)(1,3х – 1,4у4)
18. (1,5к 2– 1,6р2)(1,6р2 +1,5к2)
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