大家帮忙找下哪里有问题
import math
def quadratic_equation(a, b, c):
z=b*b-4*a*c
if z<0:
return None
else:
x1=(-b+math.sqrt(z))/(2*a)
x2=(-b-math.sqrt(z))/(2*a)
return x1,x2
print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)
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