Question

quanto é sete doze avos menos 3 quatorze avos?​

Answer 1

$\large\boxed{\begin{array}{l}\tt sete\,doze\,avos\longrightarrow\dfrac{7}{12}\\\\\tt tr\hat es\,quatorze\,avos\longrightarrow \dfrac{3}{14}.\\\\\tt\dfrac{7}{12}-\dfrac{3}{14}\\\\\begin{array}{c|c}\rm12,14&\rm2\\\rm6,7&\rm2\\\rm3,7&\rm3\\\rm1,7&\rm7\\\rm1,1\end{array}\\\rm m\cdot m\cdot c~(12,14)=2\cdot2\cdot3\cdot7=84\\\tt\dfrac{7}{12}-\dfrac{3}{14}=\dfrac{49}{84}-\dfrac{18}{84}=\dfrac{31}{84}\end{array}}$

Answer 2

$\large\boxed{\begin{array}{l} \sf{ \dfrac{7}{12} - \dfrac{3}{14} } \\ \\ \sf\begin{array}{c|c} \sf12,14& \sf2 \\ \sf6,7& \sf2 \\ \sf3,7& \sf3 \\ \sf 1,7& \sf7 \\ 1,1\end{array} \\ \sf m \cdot m \cdot c\, (12,14)=2 \cdot2 \cdot3 \cdot7 = 84 \\ \sf \dfrac{7}{12} - \dfrac{3}{14} = \dfrac{49 - 18}{84} = \dfrac{31}{84} \end{array}}$