Question

Вычислите : 7/10 - 9/49 : ( 3 - 1 13/14 ) + 2/5

Answer 1

$\frac{7}{10} -\frac{7}{49} :(3-1\frac{13}{14} )+\frac{2}{5}=$

$1) 3-1\frac{13}{14} =1\frac{1}{14}$

$2) \frac{9}{49}: 1\frac{1}{14} =\frac{9}{49} *\frac{14}{15} =\frac{6}{35}$

$3) \frac{7}{10}- \frac{6}{35} =\frac{37}{70}$

$4) \frac{37}{70} +\frac{2}{5}=\frac{13}{14}$

Ответ: $\frac{13}{14}$.