помогите, пожалуйста, даю 12 баллов
1. Решите уравнение: a) 5x^2 - 4x - 12 = 0;
б) 5х^2 + 3х - 2 = 0
в) х^2 + 10х + 9 = 0
г) 3х^2 - 9 = 0
д) 5х^2 - х + 2 = 0
е) 25х^2 + 110х + 121 =0
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