import math

def quadratic_equation(a, b, c):

    x1=0

    x2=0 

    if b*b-4*a*c>0:

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

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

    return x1 ,x2

print quadratic_equation(2, 3, 0)

print quadratic_equation(1, -6, 5)

这个有什么问题吗