Question

Помогите!!))))))))) б)

Answer 1

$3 \times \frac{2}{7} - (8 \times \frac{1}{9} - 2 \times \frac{5}{7} ) =3 \times \frac{2}{7} - (8 \times \frac{7}{63} - 2 \times \frac{45}{63} ) = 3 \times \frac{2}{7} - 5 \times \frac{25}{63} = 3 \times \frac{18}{63} - 5 \times \frac{25}{63} = - 2 \times \frac{7}{63} = - 2 \times \frac{1}{9}$