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return (-b+math.sqrt(b*b-4*a*c))/2/a , (-b-math.sqrt(b*b-4*a*c))/2/a

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而今迈步从头越

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import math

def quadratic(a, b, c):

    return (-b+math.sqrt(b*b-4*a*c))/2/a , (-b-math.sqrt(b*b-4*a*c))/2/a

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