Найти дискриминант уравнения:
а) 3x^2+2x-1=0
б) -Х^2+4x+3=0
в) Х^2-7x-4=0
г) Х^2-2,4x+1=0
д) 4Х^2-5x-4=0
e) -2Х^2+5x+3=0
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