Question

помогите нужно сделать математику!​

Answer 1

$1 \frac{2}{7} y - \frac{1}{2} = 5.2 \times 2.5 = 13 \\ 1 \frac{2}{7} y = 13 + \frac{1}{2} = 13 \frac{1}{2}$

$y = 13 \frac{1}{2} \div 1 \frac{2}{7} = \frac{27}{2} \div \frac{9}{7} \\ = \frac{27}{2} \times \frac{7}{9} = \frac{21}{2} = 10 \frac{1}{2} = 10.5$