Question

номер 115(2,4)
СРОЧНО!!!​

Answer 1

Ответ:

$a \div 1 \frac{7}{50} = \frac{5}{57} \div \frac{1}{2} \\ \frac{a}{ \frac{57}{50} } = \frac{ \frac{5}{57} }{0.5} \\ 0.5a = \frac{57}{50} \times \frac{5}{57} \\ 0.5a = 0.1 \\ a = 0.1 \div 0.5 \\ a = 0.2$

$\frac{5 - y}{4} = \frac{3}{7} \\ 7(5 - y) = 4 \times 3 \\ 35 - 7y = 12 \\ - 7y = 12 - 35 \\ - 7y = - 23 \\ y = - 23 \div - 7 \\ y = 3 \frac{2}{7}$