Question

se x=9/7 e y=7/9, então x-y é igual a:

Answer 1

Vamos lá :

$x= \frac{9}{7} ~~e~~ y= \frac{7}{9} \\ \\ x-y = \frac{9}{7} - \frac{7}{9} ~~----\ \textgreater \ ~Mmc~(7,9)~=63 \\ \\ ~~~~~~~~= \frac{81}{63} - \frac{49}{63} = \frac{32}{63} \\ \\ \\ \boxed{ x- y = \frac{32}{63} }$

Espero ter ajudado !!