به عنوان ۱: $f(x) = 4 - 5x \rightarrow y = 4 - 5x \rightarrow 5x = 4 - y \rightarrow x = (4 - y)/5 \rightarrow f^{-1}(x) = (4 - x)/5$

به عنوان ۲: $f(x) = \sqrt[3]{2x - 1} \rightarrow y = \sqrt[3]{2x - 1} \rightarrow y^3 = 2x - 1 \rightarrow 2x = y^3 + 1 \rightarrow x = (y^3 + 1)/2 \rightarrow f^{-1}(x) = (x^3 + 1)/2$

به عنوان ۳: $f(x) = (1 - 2x)^3 \rightarrow y = (1 - 2x)^3 \rightarrow \sqrt[3]{y} = 1 - 2x \rightarrow 2x = 1 - \sqrt[3]{y} \rightarrow x = (1 - \sqrt[3]{y})/2 \rightarrow f^{-1}(x) = (1 - \sqrt[3]{x})/2$