2а³+9-2(а+1)(а²-а+1) при а=0,5

2а³+9-2(а+1)(а²-а+1) при а=0,5

  • 2a^3 + 9 – 2(a+1)(a^2-a+1) = 2a^3 + 9 -2(a^3+1) = 2a^3 + 9 -2a^3 -2 = 7
    2) x(x+2)(x-2) – (x-3)(x^2+3x+9) = x(x^2-4) – (x^3-3^3) = x^3 – 4x – x^3 +27= 27-4x при x=1/4:
    =27-1=26 понятно )))
  • 1)
    2a^3 + 9 – 2(a+1)(a^2-a+1) = 2a^3 + 9 -2(a^3+1) = 2a^3 + 9 -2a^3 -2 = 7
    2) x(x+2)(x-2) – (x-3)(x^2+3x+9) = x(x^2-4) – (x^3-3^3) = x^3 – 4x – x^3 +27= 27-4x при x=1/4:
    =27-1=26