import math
a = float(input("a = "))
b = float(input("b = "))
c = float(input("c = "))

delta = pow(b, 2) - 4 * a * c

if  delta > 0        :
    x1 = (- b + math.sqrt(delta)) / (2 * a)
    x2 = (- b - math.sqrt(delta)) / (2 * a)
    print("x1 = {:.2f},x2 = {:.2f}".format(x1,x2))
elif delta == 0:
    x1 = (- b + math.sqrt(delta)) / (2 * a)
    print("x1=x2 = {:.2f}".format(x1))
else:
    print("方程没有实数根")