Question

Решите уравнение(зад 2)

Answer 1

Решаем пропорцию
9(x - 1)(x^2 + x + 1) = 7(x + 1)(x^2 - x + 1)
9(x^3 - x^2 + x^2 - x + x - 1) = 7(x^3 + x^2 - x^2 - x + x + 1)
9x^3 - 9 = 7x^3 + 7
2x^3 = 16
x^3 = 8
x = 2