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$25\%=\dfrac{1}{4}$
$1\dfrac{5}{6}=\dfrac{11}{6}$
$2\dfrac{4}{7}=\dfrac{18}{7}$
$50\%=\dfrac{1}{2}$
$1,25=\dfrac{5}{4}$
$2\dfrac{3}{4}=\dfrac{11}{4}$
$6\dfrac{8}{11}=\dfrac{74}{11}$
$4\dfrac{15}{49}=\dfrac{211}{49}$
$2\dfrac{1}{5}=\dfrac{11}{5}$