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\(\frac{1}{4}.....\frac{7}{{16}} + \frac{5}{{16}}\) \(\frac{1}{7} + \frac{2}{7}.....\frac{{11}}{{21}} - \frac{2}{{21}}\)

\(\frac{4}{5}.....\frac{{41}}{{40}} - \frac{{17}}{{40}}\) \(\frac{{21}}{{15}} - \frac{6}{{15}}.....\frac{2}{5} + \frac{2}{5}\)

\(\frac{1}{4} < \frac{7}{{16}} + \frac{5}{{16}}\)

Giải thích:                

\(\frac{1}{4} < \frac{7}{{16}} + \frac{5}{{16}} = \frac{{12}}{{16}} = \frac{3}{4}\)

\(\frac{1}{7} + \frac{2}{7} = \frac{{11}}{{21}} - \frac{2}{{21}}\)

Giải thích:

\(\frac{1}{7} + \frac{2}{7} = \frac{3}{7} = \frac{{11}}{{21}} - \frac{2}{{21}} = \frac{3}{7}\)

\(\frac{4}{5} > \frac{{41}}{{40}} - \frac{{17}}{{40}}\)

Giải thích:

\(\frac{4}{5} > \frac{{41}}{{40}} - \frac{{17}}{{40}} = \frac{3}{5}\)

\(\frac{{21}}{{15}} - \frac{6}{{15}} > \frac{2}{5} + \frac{2}{5}\)

Giải thích:

\(\frac{{21}}{{15}} - \frac{6}{{15}} = 1 > \frac{2}{5} + \frac{2}{5} = \frac{4}{5}\)