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Теорема Виета:
x^2 + px + q = 0
x1 * x2 = -p
x1 * x2 = q
x1 = 8
x2 = -7
8 + (-7) = -p
8 * (-7) = q
p = -1
q = -56
x^2 - x - 56 = 0
x^2 - px + 6 = 0
x1 = 1
x1 + x2 = -p
x1 * x2 = q = 6
x2 = 6 / 1 = 6
x1 + x2 = -p
1 + 6 = -p
p = -7
x^2 + px + q = 0
x1 * x2 = -p
x1 * x2 = q
x1 = 8
x2 = -7
8 + (-7) = -p
8 * (-7) = q
p = -1
q = -56
x^2 - x - 56 = 0
x^2 - px + 6 = 0
x1 = 1
x1 + x2 = -p
x1 * x2 = q = 6
x2 = 6 / 1 = 6
x1 + x2 = -p
1 + 6 = -p
p = -7
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