Rút gọn các phân số: \(\frac{15}{25}\); \(\frac{18}{27}\); \(\frac{36}{64}\).
\(\frac{15}{25}\) = \(\frac{15:5}{25:5}\) = \(\frac{3}{5}\);
\(\frac{18}{27}\) = \(\frac{18 :9}{27:9}\) = \(\frac{2}{3}\);
\(\frac{36}{64}\) = \(\frac{36:4}{64 : 4}\) = \(\frac{9}{16}\).
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