import math

def quadratic(a,b,c):

if (b**2-4*a*c)<0:

print('无解')

else:

x1=(-b+math.sqrt(b**2-4*a*c))/2/a

x2=(-b-math.sqrt(b**2-4*a*c))/2/a

return x1,x2

a=float(input('a='))

b=float(input('b='))

c=float(input('c='))

print(quadratic(a,b,c))