Какие уравнения не имеют действительных корней:
А) 9х^2 - 42x + 50 = 0
Б) (2х - 4)(2х+4) +16 = 4х^2
В) 5х^3
   ______
    х^2 = 0
Г)   / 3
   _____ х - 8/ + 8 = 0
     /  7
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