Question

ajudem pfvr pra hojeee​

Answer 1

a)

$(\frac{2}{7} +\frac{2}{7} )-(\frac{1}{5} +\frac{2}{5} )\\\\(\frac{14+14}{49} )-(\frac{5+10}{25} )\\\\\frac{28}{49} -\frac{15}{25} \\\\\frac{700-735}{1225} \\\\\frac{-35}{1225} \\\\-\frac{1}{35}$

b)

$\frac{9}{10} +\frac{2}{20}\\\\\frac{180+20}{200} \\\\\frac{200}{200} \\\\1$

c)

$15-\frac{4}{9} \\\\\frac{15}{1} -\frac{4}{9} \\\\\frac{135-4}{9} \\\\\frac{131}{9}$