Задание No2.
Является ли квадратным уравнение?
а)7х2 –5х + 1 = 0
б) 48х2 – 5х 3 – 9 = 0
в) 21х2 + 23х – 11 = 0
г) 1 – 12х = 0
д) 7х2 – 13 = 0
е) – х 2 = 0
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