import math
# sqrt函数用来求平方根，需要导入math库来使用
a = float(input("a = "))
b = float(input("b = "))
c = float(input("c = "))                   

delta = pow(b, 2) - 4*a*c         
x1 = (- b + math.sqrt(delta)) / (2 * a)
x2 = (- b - math.sqrt(delta)) / (2 * a)
print("x1 = {:.2f}".format(x1))
print("x2 = {:.2f}".format(x2))