Ответ:=41.5

Объяснение:

[tex]\frac{xy}{y-x}=\frac{2}{83} = > \frac{y-x}{xy} =\frac{83}{2} \\ \frac{y-x}{xy}=\frac{y}{xy} - \frac{x}{xy} = \frac{1}{x}-\frac{1}{y} \\= > \frac{1}{x}-\frac{1}{y} =\frac{83}{2} =41.5[/tex]

Verified answer

[tex] \frac{xy}{y - x} = \frac{2}{83} \: \: \: \: \: \: \: - > \: \: \: \: \: \: \: \frac{y - x}{xy} = \frac{83}{2} \\ \frac{1}{x} - \frac{1}{y} = \frac{y - x}{xy} = \frac{83}{2} = 41.5[/tex]