Вычислите дискриминант квадратного уравнения и укажите число его корней:

а) 2x^2 + 3x + 1 = 0

б) 2x^2 +x + 2 = 0

в) 9x^2 + 6x + 1 = 0

г) x^2 + 5x - 6 = 0
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