a: \(\dfrac{2}{8}=\dfrac{1}{4}\)
\(\dfrac{4}{8}=\dfrac{1}{2};\dfrac{2}{4}=\dfrac{1}{2}\)
b: \(\dfrac{1}{2}=\dfrac{2}{4}=\dfrac{3}{6}=\dfrac{4}{8}=\dfrac{6}{12}\)
\(\dfrac{1}{4}=\dfrac{2}{8}=\dfrac{3}{12}=\dfrac{4}{16}=\dfrac{6}{24}\)
\(\dfrac{3}{4}=\dfrac{6}{8}=\dfrac{9}{12}=\dfrac{12}{16}\)
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