а) $$\frac{7}{9}$$ : $$\frac{7}{18}$$ = $$\frac{7}{9}$$ × $$\frac{18}{7}$$ = 2
б) $$\frac{3}{4}$$ : $$\frac{7}{9}$$ = $$\frac{3}{4}$$ × $$\frac{9}{7}$$ = $$\frac{27}{28}$$
в) $$\frac{3}{4}$$ : 3 = $$\frac{3}{4}$$ × $$\frac{1}{3}$$ = $$\frac{1}{4}$$
г) 6 : $$\frac{6}{11}$$ = 6 × $$\frac{11}{6}$$ = 11
д) 5 : $$\frac{1}{7}$$ = 5 × 7 = 35
Ответ: а) 2; б) $$\frac{27}{28}$$; в) $$\frac{1}{4}$$; г) 11; д) 35