Question

[(1/3-2/7)+2/1+2/7]-(4/3-5/21) aqui deu 22/21, ta certo?

Answer 1

$[ (\frac{1}{3}- \frac{2}{7} )+ \frac{2}{1} + \frac{2}{7} ]-( \frac{4}{3} - \frac{5}{21})$
$[ (\frac{1}{21})+ \frac{16}{7}]-( \frac{23}{21})$
$[ (\frac{49}{21}- \frac{23}{21})$
$[ (\frac{26}{21})$