Question

Calcular "A . B", si:A = 2 /7 + 1 /3 y B = 5 2/ 8

Answer 1

$( \frac{2}{7} + \frac{1}{3} ) ( \frac{42}{8} )$
resolvemos lo del primer parentesis:
$( \frac{6 + 7}{21} ) ( \frac{42}{8} )$
$( \frac{13}{21} ) ( \frac{42}{8} )$
luego multiplicamos :
$\frac{546}{168}$
simplificando queda:
$\frac{78}{24}$