Ответы на вопрос:
A+ b = 6 ab = -7 a = 6 - b (6-b)b = -7 b^2 - 6b - 7 = 0 b1 = (6 + 8)/2 = 7, a1 = -1 b2 = (6 - 8)/2 = -1, a2 = 7
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