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复习(先考虑特殊情况)

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if a == 0:
    x = -c/b
else:
    q = b**2 - 4*a*c
    if q < 0:
        print('无实根')
    else:
        w = math.sqrt(q)
        x1 = (-b+w)/(2*a)
        x2 = (-b-w)/(2*a)
        return(x1,x2)

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