a, 9/4=9x5/4x5=45/20 7/5=7x4/5x4=28/20
9/4=9x7/4x7=63/28 5/7=5x4/7x4=20/28
b, 3/4=3x6/4x6=18/24 9/24
7/5=7x2/5x2=14/10 6/10
9/24 và 6/10 e ghi thêm phía sau là giữ nguyên nhé
\(\frac{9}{4}\)và \(\frac{7}{5}\)
\(\frac{9}{4}=\frac{9.5}{4.5}=\frac{45}{20}\); \(\frac{7}{5}=\frac{7.4}{5.4}=\frac{28}{20}\)
\(\frac{9}{4}\)và \(\frac{5}{7}\)
\(\frac{9}{4}=\frac{9.7}{4.7}=\frac{63}{28}\); \(\frac{5}{7}=\frac{5.4}{7.4}=\frac{20}{28}\)
\(\frac{3}{4}\)và \(\frac{9}{24}\)
\(\frac{3}{4}=\frac{3.6}{4.6}=\frac{18}{24}\); \(\frac{9}{24}\)
\(\frac{7}{5}\)và \(\frac{6}{10}\)
\(\frac{7}{5}=\frac{7.2}{5.2}=\frac{14}{10}\); \(\frac{6}{10}\)
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