Question

5 1/7(у-7)-3 3/7(14-у) при у= -0,7​

Answer 1

$5 \frac{1}{7} (y - 7) - 3 \frac{3}{7} (14 - y) = 5 \frac{1}{7} y - \frac{36 \times 7}{7} - \frac{24 \times 14}{7} + 3 \frac{3}{7} y = 8 \frac{4}{7} y - 36 - 48 = 8 \frac{4}{7} y - 84 = 8 \frac{4}{7} \times ( - 0.7) - 84 = - \frac{60 \times 7}{7 \times 10} - 84 = - 6 - 84 = - 90$