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)?這樣。不知道哪里錯了
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