Ta có 2/4=5/10;2/5=4/10;4/2=10/5;5/2=10/4
\(\frac{2}{4}=\frac{5}{10};\frac{2}{5}=\frac{4}{10};\frac{10}{4}=\frac{5}{2};\frac{10}{5}=\frac{4}{2}\)
\(\frac{2}{4}=\frac{5}{10}:\frac{2}{5}=\frac{4}{10}:\frac{10}{4}=\frac{5}{2}:\frac{10}{5}=\frac{4}{2}\)
\(\frac{2}{4}=\frac{5}{10};\frac{2}{5}=\frac{4}{10};\frac{10}{4}=\frac{5}{2};\frac{10}{5}=\frac{4}{2}\)