$\mathrm{12,50}={\displaystyle \frac{1250}{100}}12\{,\}50=\backslash dfrac\{1250\}\{100\}$

$\mathrm{12,50}12\{,\}50$% $={\displaystyle \frac{1250}{100\cdot 100}}={\displaystyle \frac{1250}{10000}}={\displaystyle \frac{1}{8}}=\backslash dfrac\{1250\}\{100\backslash cdot100\}=\backslash dfrac\{1250\}\{10000\}=\backslash dfrac\{1\}\{8\}$

$\mathrm{0,05}={\displaystyle \frac{5}{100}}={\displaystyle \frac{1}{20}}0\{,\}05=\; \backslash dfrac\{5\}\{100\}=\backslash dfrac\{1\}\{20\}$

$\mathrm{0,428571}={\displaystyle \frac{428571}{100000}}\approx {\displaystyle \frac{3}{7}}0\{,\}428571=\backslash dfrac\{428571\}\{100000\}\backslash approx\backslash dfrac\{3\}\{7\}$