Question

quanto é 3/7 × (1- 2/5+ 1/3) ÷ 2/5
pfv me ajudem

Answer 1

    $\frac{3}{7}\times\frac{1-\frac{2}{5}+\frac{1}{3}}{\frac{2}{5}}=$

$=\frac{3}{7}\times\frac{\frac{15}{15}-\frac{2\times3}{5\times3}+\frac{5}{3\times5}}{\frac{2}{5}}=$

$=\frac{3}{7}\times\frac{\frac{15}{15}-\frac{6}{15}+\frac{5}{15}}{\frac{2}{5}}=$

$=\frac{3}{7}\times\frac{\frac{9}{15}+\frac{5}{15}}{\frac{2}{5}}=$

$=\frac{3}{7}\times\frac{\frac{14}{15}}{\frac{2}{5}}=$

$=\frac{3}{7}\times\frac{14\times5}{15\times2}=$

$=\frac{3}{7}\times\frac{70}{30}=$

$=\frac{3}{7}\times\frac{7}{3}=$

$=\frac{3\times7}{7\times3}=$

$=\frac{21}{21}=$

$=1$