Question

resolva as seguintes operações 3/5 - 1/4 ?​

Answer 1

$\begin{array}{cc|l}5&4&2\\5&2&2\\5&1&5\\1&1&\!\!\!\overline{~\:2\cdot2\cdot5=20~}\end{array}$

$MMC(5,4)=20$

$\dfrac{3}{5}-\dfrac{1}{4}= \dfrac{12}{20}-\dfrac{5}{20}$

$\dfrac{3}{5}-\dfrac{1}{4}=\dfrac{12-5}{20}$

$\red{\boldsymbol{\dfrac{3}{5}-\dfrac{1}{4}=\dfrac{7}{20} }}$