Question

Me ajudem com essa fração

Answer 1

m.m.c (5,4) = 20
$[ \frac{7}{3} *( \frac{2}{5} - \frac{7}{4} ) + \frac{1}{2} ]=\\\\ \frac{7}{3} *( -\frac{27}{20} ) + \frac{1}{2}=\\\\ - \frac{63}{20} + \frac{1}{2} = \frac{-63 + 10}{20} = \boxed{-\frac{53}{20} }$