3 9 3⋅9 27 ) ─ ⋅ ─ = ─── = ── 8 11 8⋅11 88 21 21 д) ─ ⋅ ─ = 35 44 3 4 3 4 3 б)5─ ⋅ 1─ = ─ ⋅ ─ = ─ 5 21 28 25 72 3 3 2)9─ ⋅ 4─ 7 11

a)

1. $$\frac{3}{8} \cdot \frac{9}{11} = \frac{3 \cdot 9}{8 \cdot 11} = \frac{27}{88}$$
2. Ответ: $$\frac{27}{88}$$

д)

1. $$\frac{21}{35} \cdot \frac{21}{44} = \frac{21}{70}$$
2. Ответ: $$\frac{21}{70}$$

б)

1. $$5\frac{3}{5} \cdot 1\frac{4}{21} = \frac{28}{5} \cdot \frac{25}{21} = \frac{3}{72}$$
2. Ответ: $$\frac{3}{72}$$

2)

1. $$9\frac{3}{7} \cdot 4\frac{3}{11} $$