Raíces cúbicas de expresiones compuestas.

12. ${\displaystyle \frac{3a}{a+2}}$.

13. ${\displaystyle \frac{x}{x-1}}$.

14. ${\displaystyle \frac{y}{x^2+3xy+9y^2}}$.

15. ${\displaystyle \frac{x+1}{x-5}}$.

16. ${\displaystyle \frac{x+1}{x-2}}$.

17. ${\displaystyle \frac{a+b+c}{a}}$.

18. ${\displaystyle \frac{x+5}{x+3}}$.

19. ${\displaystyle \frac{x+1}{x+3}}$.

[2]Ejercicio43.

1. $a+b+{\displaystyle \frac{2}{a-b}}$.

2. $a-b-{\displaystyle \frac{2}{a+b}}$.

3. $a-1+{\displaystyle \frac{2a}{a^2-a-1}}$.

4. $2x-4+{\displaystyle \frac{5}{x+1}}$.

5. $4x^2-2x+1-{\displaystyle \frac{1}{2x+1}}$.

6. $5x+4+{\displaystyle \frac{x+7}{x^2+x-1}}$.

7. $a+{\displaystyle \frac{5a-2}{a^2+a+2}}$.

8. $y^2-yx+x^2$.

9. $x^2-4x+3+{\displaystyle \frac{2x-4}{x^2+x+1}}$.

10. $x^3+x+1+{\displaystyle \frac{2x+2}{x^2-x-1}}$.

[2]Ejercicio44.

1. ${\displaystyle \frac{x^2+y^2}{x-y}}$.

2. ${\displaystyle \frac{x^2+y^2}{x+y}}$.

3. ${\displaystyle \frac{2y}{x+y}}$.