import mathdef quadratic(a,b,c):    if not isinstance(a,(int,float)) and isinstance(b,(int,float)) and isinstance(c,(int,float)):        raise TypeError('bad operand type')    d = b**2-4*a*c    print('d值为',d)    if a == 0:        x1 = -c/b        print('方程唯一解：',x1)    elif d>=0:        x2 = (-b+math.sqrt(d)/(2*a))        x3 = (-b-math.sqrt(d)/(2*a))        return x2,x3    else:        print('方程无实根')print(quadratic(2,5,1))