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Решите задачу:

$\frac{7}{18} =\frac{7}{2*9}; \frac{5}{9}=\frac{5*2}{9*2}=\frac{10}{18}; \\ \frac{10}{21}= \frac{10}{3*7}; \frac{2}{3} = \frac{2*7}{3*7}= \frac{14}{21}; \\ \frac{5}{7}= \frac{5*4}{7*4}= \frac{20}{28}; \frac{3}{4} =\frac{3*7}{4*7}=\frac{21}{28} ; \\ 14=2*7; 20=2*10; \frac{9}{14} = \frac{9*10}{14*10} =\frac{90}{140}; \frac{13}{20}= \frac{13*7}{20*7}= \frac{91}{140}$

$\frac{7}{9}= \frac{7*11}{9*11}= \frac{77}{99} \ \textless \ \frac{9}{11} =\frac{9*9}{11*9} =\frac{81}{99}$

$\frac{3}{4}= \frac{3*2}{4*2}= \frac{6}{8}\ \textgreater \ \frac{3}{8} ;$

$\frac{7}{12}= \frac{7*5}{12*5}=\frac{35}{60} \ \textless \ \frac{3}{5} =\frac{3*12}{5*12}=\frac{36}{60}$

$\frac{7}{100}\ \textless \ \frac{3}{10}=\frac{30}{100} \\ \\ \frac{11}{17}= \frac{55}{85}\ \textgreater \ \frac{3}{5} = \frac{34}{85}$