f(x)=x^3-2
xi=big"2"^(big"1"/big"3")
x0=big"1"
x1=big"1.5"

g(xn,xnm1)=xn-f(xn)*(xn-xnm1)/(f(xn)-f(xnm1))

xnm1=x0
xn=x1
for n=2:10
	global xn,xnm1
	xn,xnm1=g(xn,xnm1),xn
	println("n=$n xn=$xn en=$(xn-xi)")
end