Является ли квадратным уравнение:1)2, 5х^2-3х+7=0 2)8-1, 3х^2 =0. 3)16х-0, 25=0. 4)19х^2+х^4+1=0. 5)1/5х2+х-6, 9=0. 6)х^2-корень7=0
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