1) $\frac{2}{7}+\frac{1}{14}=\frac{2\ast 2+1}{14}=\frac{4+1}{14}=\frac{5}{14}$
2) $\frac{5}{14}\ast \frac{7}{10}=\frac{5\ast 7}{14\ast 10}=\frac{1\ast 1}{2\ast 2}=\frac{1}{4}$
3) $\frac{1}{4}\ast \frac{1}{4}=\frac{1\ast 1}{4\ast 4}=\frac{1}{16}$
4) $\frac{1}{16}\ast 32=\frac{1\ast 32}{16}=\frac{2}{1}=2$
5) $2-1\frac{5}{13}=1\frac{13}{13}-1\frac{5}{13}=\frac{8}{13}$
Ответ:

1) $\frac{11}{18}-\frac{1}{9}=\frac{11-1\ast 2}{18}=\frac{11-2}{18}=\frac{9}{18}=\frac{1}{2}$
2) $\frac{1}{2}\ast 2\frac{2}{3}=\frac{1}{2}\ast \frac{8}{3}=\frac{1\ast 8}{2\ast 3}=\frac{1\ast 4}{1\ast 3}=\frac{4}{3}=1\frac{1}{3}$
3) $1\frac{1}{3}\ast \frac{1}{2}=\frac{4}{3}\ast \frac{1}{2}=\frac{4\ast 1}{3\ast 2}=\frac{2\ast 1}{3\ast 1}=\frac{2}{3}$
4) $\frac{2}{3}+\frac{5}{6}=\frac{2\ast 2+5}{6}=\frac{4+5}{6}=\frac{9}{6}=\frac{3}{2}=1\frac{1}{2}$
5) $1\frac{1}{2}\ast 10=\frac{3}{2}\ast 10=\frac{3\ast 10}{2}=\frac{3\ast 5}{1}=15$
Ответ: