a: \(\dfrac{9}{12}=\dfrac{9:3}{12:3}=\dfrac{3}{4}=\dfrac{3\cdot2}{4\cdot2}=\dfrac{6}{8}\)
\(\dfrac{20}{32}=\dfrac{20:4}{32:4}=\dfrac{5}{8}\)
b: \(\dfrac{18}{12}=\dfrac{18:6}{12:6}=\dfrac{3}{2}=\dfrac{3\cdot4}{2\cdot4}=\dfrac{12}{8}\)
\(\dfrac{20}{32}=\dfrac{20:4}{32:4}=\dfrac{5}{8}\)
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