Question

Даю 60б Срочно помогите ​

Answer 1

$\frac{x}{y} = a \\ \frac{y}{z} = \frac{1}{a} \\ \frac{y}{z} = \frac{1}{ \frac{x}{y} } \\ \frac{y}{z} = \frac{y}{x} \\ \frac{1}{z} = \frac{1}{x} \\ z = x$

$\frac{x}{z} = \frac{x}{x} = 1$