$\dfrac{5}{10}=\dfrac{1}{2}$
$\dfrac{25}{75}=\dfrac{1}{3}$
$\dfrac{1}{2}=\dfrac{1 × 3}{2 × 3}=\dfrac{3}{6}$
$\dfrac{1}{3}=\dfrac{1 × 2}{3 × 2 }=\dfrac{2}{6}$
$\dfrac{42}{56}=\dfrac{3}{4}$
$\dfrac{18}{48}=\dfrac{3}{8}$
$\dfrac{3}{4}=\dfrac{3 × 2}{4 × 2}=\dfrac{6}{8}$
$\dfrac{3}{8}$ không phải quy đồng
$\dfrac{57}{76}=\dfrac{3}{4}$
$\dfrac{35}{84}=\dfrac{5}{12}$
$\dfrac{3}{4}=\dfrac{3 × 3 }{4 × 3}=\dfrac{9}{12}$
$\dfrac{5}{12}$ không phải quy đồng