Phép so sánh đúng là:

\(\frac{5}{7} + \frac{1}{{14}} > 1\)

\(\frac{8}{9} + \frac{{11}}{{18}} < 1\)

\(\frac{7}{{15}} + \frac{1}{5} > 1\)

\(\frac{6}{{49}} + \frac{2}{7} < 1\)