№34.6
1) (a - 1)(a^2 + a + 1) - a^2(a - 8) = a^3 + a^2 + a - a^2 - a - 1 - a^3 + 8a^2 =
= -1 + 8a^2 = 8a^2 - 1
Ответ: 8a^2 - 1
№34.7
1) (2x - 3)(4x^2 + 6x + 9) - 8x^3 = 2,7x
8x^3 + 12x^2 + 18x - 12x^2 - 18x - 27 - 8x^3 = 2,7x
-2,7x = 27
x = 27 : (-2,7)
x = -10
Ответ: x = -10