Lösung Hauptnenner

Finde den Hauptnenner folgender Brüche

1. \(\frac{1}{x}; \frac{2}{x-4} \)
2. \(\frac{x}{5x+2}; \frac{1}{10x+4} \)
3. \(\frac{4}{x-1}; \frac{2}{x+1} \)
4. \(\frac{1}{x-2}; \frac{x}{x^2-4x+4} \)
5. \(\frac{1}{b-7}; \frac{1}{7-b} \)