\[\left( \frac{x - 1}{x} \right)^{- 2} \cdot \left( x^{- 2} - 2x^{- 1} + 1 \right) =\]
\[= \frac{x^{2}\left( x^{- 2} - 2x^{- 1} + 1 \right)}{(x - 1)^{2}} =\]
\[= \frac{x^{2} \cdot x^{- 2} - 2x^{2}x^{- 1} + x^{2}}{x^{2} - 2x + 1} =\]
\[= \frac{1 - 2x + x²}{x² - 2x + 1} = 1\]