2 6 3а 5 )- 7 8 а 10 July 8, 2019 16 32 64 128 6 3/7а-8 5/8 5 +6 +7 /8 -7 7) 10(a ^ 2 - 5) + (a ^ 2 - 5) ^ 2 8) (a - 2) ^ 2 - 6(a - 2)