1) $$2 \frac{2}{3} \cdot 2 \frac{1}{7} = \frac{8}{3} \cdot \frac{15}{7} = \frac{8 \cdot 5}{1 \cdot 7} = \frac{40}{7} = 5 \frac{5}{7}$$.
2) $$9 - 5 \frac{5}{7} = 8 \frac{7}{7} - 5 \frac{5}{7} = 3 \frac{2}{7} = \frac{23}{7}$$.
3) $$ \frac{23}{7} \cdot \frac{21}{46} = \frac{1 \cdot 3}{1 \cdot 2} = \frac{3}{2} = 1 \frac{1}{2}$$.
Ответ: $$1 \frac{1}{2}$$.