However, when some of the above mentioned methods are applied to solve
the equation f(x) = 0 , it is needed to calculate the derivative of the function,
which is sometimes inconvenient. To avoid the calculation of derivatives, we
may replace the derivatives with divided difference. Then the problem of
convergence arise. In the section 2 of this paper, we use divided difference
to replace the derivatives appearing in the above mentioned algorithms to get
some numerical methods and show the convergence of the obtained methods.
In section 3, we give some numerical illustrations.