255. Найдите сумму и произведение корней уравнения:
а) х2 – 6х + 9 = 0; в) 3х2 - 7х + 4 = 0;
б) х2 + 4х + 4 = 0; г) 4х2 + 7x - 15 = 0.
Срочнооооо!
Пжжжж фото нужнооооо​
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