а) $$ \frac{3}{10} = 3 : 10; \frac{40}{9} = 40 : 9; \frac{1}{8} = 1 : 8$$.
б) $$1 = \frac{1}{1} = \frac{2}{2} = \frac{3}{3}$$.
Ответ: а) $$ \frac{3}{10} = 3 : 10; \frac{40}{9} = 40 : 9; \frac{1}{8} = 1 : 8$$; б) $$1 = \frac{1}{1} = \frac{2}{2} = \frac{3}{3}$$