Question

Quanto da (6/7-9/14)×(15/21+12/7)

Answer 1

$( \frac{12 - 9}{14}) \times ( \frac{15 + 36}{21}) \\ \\ \frac{3}{14} \times \frac{51}{21} = \frac{153}{294}$
simplifica dividindo por 3 e fica 51/98