Срочно решите все уравнения, даю 30 баллов!
Решите уравнения:
а) х2 + 5х + 6 = 0;
б) 7х2 + 8х + 1 = 0.
в) (х + 3)2 = 2х + 6;
г) (х – 2)(х + 2) = 5х – 10
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