Блок А. Выполните действия: 1) \(\frac{4}{11}+\frac{5}{11}\); 2) \(\frac{17}{20}-\frac{7}{20}\); 3) \(\frac{x}{6}+\frac{5}{6}\); 4) \(\frac{8}{a}-\frac{3}{a}\); 5) \(\frac{3m}{14}+\frac{5m}{14}\); 6) \(\frac{7}{2x}-\frac{y}{2x}\); 7) \(\frac{a^2}{9}+\frac{2a}{9}\); 8) \(\frac{4c}{d}-\frac{9}{d}\); 9) \(\frac{x}{y^2}+\frac{5}{y^2}\); 10) \(\frac{8m}{n^3}-\frac{3m}{n^3}\); 11) \(-\frac{5a}{bc}+\frac{2a}{bc}\); 12) \(\frac{11}{x^2}-\frac{11}{x^2}\); 13) \(\frac{2k}{p}+\frac{3k}{p}\); 14) \(\frac{a^3}{b}-\frac{1}{b}\); 15) \(\frac{6x}{5y}+\frac{x}{5y}\).

При одинаковых знаменателях складываем или вычитаем числители, а знаменатель оставляем прежним.

1. \(\frac{4+5}{11}=\frac{9}{11}\).
2. \(\frac{17-7}{20}=\frac{10}{20}=\frac{1}{2}\).
3. \(\frac{x+5}{6}\).
4. \(\frac{8-3}{a}=\frac{5}{a}\).
5. \(\frac{3m+5m}{14}=\frac{8m}{14}=\frac{4m}{7}\).
6. \(\frac{7-y}{2x}\).
7. \(\frac{a^2+2a}{9}\).
8. \(\frac{4c-9}{d}\).
9. \(\frac{x+5}{y^2}\).
10. \(\frac{8m-3m}{n^3}=\frac{5m}{n^3}\).
11. \(\frac{-5a+2a}{bc}= -\frac{3a}{bc}\).
12. \(\frac{11-11}{x^2}=0\).
13. \(\frac{2k+3k}{p}=\frac{5k}{p}\).
14. \(\frac{a^3-1}{b}\).
15. \(\frac{6x+x}{5y}=\frac{7x}{5y}\).