Пожалуйста, помогите! Сравните дроби : 7/10 и 13/20 , 2/3 и 5/8 , 7/10 и 3/4 ; 7/9 и 5/6...

1) $\frac{7}{10}= \frac{14}{20} ; \frac{14}{20}\ \textgreater \ \frac{13}{20}; \frac{7}{10}\ \textgreater \ \frac{13}{20}$
2) $\frac{2}{3}= \frac{16}{24}; \frac{5}{8}= \frac{15}{24}; \frac{16}{24}\ \textgreater \ \frac{15}{24}; \frac{2}{3}\ \textgreater \ \frac{5}{8}$
3) $\frac{7}{10}= \frac{14}{20}; \frac{3}{4}= \frac{15}{20}; \frac{14}{20}\ \textless \ \frac{15}{20}; \frac{7}{10}\ \textless \ \frac{3}{4}$
4) $\frac{7}{9}= \frac{14}{18}; \frac{5}{6}= \frac{15}{18}; \frac{14}{18}\ \textless \ \frac{15}{18}; \frac{7}{9}\ \textless \ \frac{5}{6}$
5) $\frac{7}{15}= \frac{28}{60}; \frac{9}{20}= \frac{27}{60}; \frac{28}{60}\ \textgreater \ \frac{27}{60}; \frac{7}{15}\ \textgreater \ \frac{9}{20}$