a) $\frac{9}{5}$và $\frac{{21}}{{40}}$
$\frac{9}{5} = \frac{{9 \times 8}}{{5 \times 8}} = \frac{{72}}{{40}}$
b) $\frac{{17}}{{30}}$và $\frac{{53}}{{90}}$
$\frac{{17}}{{30}} = \frac{{17 \times 3}}{{30 \times 3}} = \frac{{51}}{{90}}$
c) $\frac{1}{3};\frac{7}{{12}}$và $\frac{{35}}{{48}}$
$\frac{1}{3} = \frac{{1 \times 16}}{{3 \times 16}} = \frac{{16}}{{48}}\,;\,\,\frac{7}{{12}} = \frac{{7 \times 4}}{{12 \times 4}} = \frac{{28}}{{48}}$
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