1. \(\dfrac{4}{1-x}\text{.}\)

  2. \(\dfrac{2}{(1-x)^2}\text{.}\)

  3. \(\dfrac{2x^3}{(1-x)^2}\text{.}\)

  4. \(\dfrac{1}{1-5x}\text{.}\)

  5. \(\dfrac{1}{1+3x}\text{.}\)

  6. \(\dfrac{1}{1-5x^2}\text{.}\)

  7. \(\dfrac{x}{(1-x^3)^2}\text{.}\)