Question

1/x=1/y+1/z  Найдите z.

Answer 1

$frac{1}{x}=frac{1}{y}+frac{1}{z}\frac{1}{z}=frac{1}{x}-frac{1}{y}\frac{1}{z}=frac{y-x}{xy}\z=frac{xy}{y-x}$