Question

помогите пожалуйста​

Answer 1

Ответ:

$\frac{8}{20} = \frac{x}{5} \\x = \frac{8*5}{20} \\x = 2\\\\\\\frac{9}{x} = \frac{3}{7} \\x = \frac{9*7}{3} \\x= 21\\\\\\\frac{x}{16}=\frac{3}{4}\\ x=\frac{16*3}{4} \\x=12\\\\\\\frac{10}{25} =\frac{2}{x} \\x=\frac{25*2}{10} \\x=5$