1+\frac{1}{1+\frac{1}{1+\frac{1}{1}}}
źródło:
1+\frac{1}{1+\frac{1}{1+\frac{1}{1}}}=
=1+\frac{1}{1+\frac{1}{1+1}}=
=1+\frac{1}{1+\frac{1}{2}}=1+\frac{1}{\frac{3}{2}}=1+\frac{2}{3}=1\frac{2}{3}