Решите 3 уравнения, пожалуйста.
1) x^4 - 8x^2 + 7 = 0 (b-квадратное уравнение)
2) x^4 - x^3 - 7x^2 + x + 6 = 0 (Теорема Безу)
3) x(x + 3)(x + 5)(x + 8) = -56
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