test_cases = [
    (1, -3, 2),   # D = 1 > 0, есть вещественные корни
    (1, 2, 1),    # D = 0, есть вещественный корень
    (1, 1, 1),    # D = -3 < 0, нет вещественных корней
    (0, 2, 3),    # линейное уравнение, есть корень
    (0, 0, 5),    # нет корней
    (0, 0, 0),    # бесконечно много корней
]
 
for A, B, C in test_cases:
    if A == 0:
        if B == 0:
            print(f"A={A}, B={B}, C={C}: {C == 0}")
        else:
            print(f"A={A}, B={B}, C={C}: True")
    else:
        D = B**2 - 4*A*C
        print(f"A={A}, B={B}, C={C}: {D >= 0}")

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