Вариант №1 №3 12 5 121.51 1.1 1 Образец: №4 2 1 5 6 51-62 1-2 2 15 24 153-242 3-2-6 13.15-3011-1-2 №1 №2 Образец: Образец: Образец: 2 5 2-5 10 5 6 373-7 21 4. Решите: Решите: Решите: 1. 1. 8. 1. 2.5 2. 2. 7 3.1.2 3. 3. 12 50 4. 11. 4.10 4. 1000 5. 6.10 5. 5. 11 14.64 32 7 55 Решите: 1. 2 2. 3½ 1½ 3. 1-2 4. 1 5. 22

№1

1. \[\frac{2}{5} \cdot \frac{3}{7} = \frac{2 \cdot 3}{5 \cdot 7} = \frac{6}{35}\]

2. \[\frac{1}{8} \cdot \frac{5}{6} = \frac{1 \cdot 5}{8 \cdot 6} = \frac{5}{48}\]

3. \[\frac{7}{11} \cdot \frac{2}{3} = \frac{7 \cdot 2}{11 \cdot 3} = \frac{14}{33}\]

4. \[\frac{10}{11} \cdot \frac{2}{3} = \frac{10 \cdot 2}{11 \cdot 3} = \frac{20}{33}\]

5. \[\frac{1}{15} \cdot \frac{4}{5} = \frac{1 \cdot 4}{15 \cdot 5} = \frac{4}{75}\]

№2

1. \[8 \cdot \frac{2}{3} = \frac{8 \cdot 2}{3} = \frac{16}{3} = 5\frac{1}{3}\]

2. \[\frac{3}{5} \cdot 5 = \frac{3 \cdot 5}{5} = 3\]

3. \[\frac{12}{13} \cdot 2 = \frac{12 \cdot 2}{13} = \frac{24}{13} = 1\frac{11}{13}\]

4. \[11 \cdot \frac{1}{2} = \frac{11 \cdot 1}{2} = \frac{11}{2} = 5\frac{1}{2}\]

5. \[6 \cdot \frac{10}{11} = \frac{6 \cdot 10}{11} = \frac{60}{11} = 5\frac{5}{11}\]

№3

1. \[\frac{12}{15} \cdot \frac{3}{4} = \frac{12 \cdot 3}{15 \cdot 4} = \frac{36}{60} = \frac{3}{5}\]

2. \[\frac{11}{16} \cdot \frac{4}{33} = \frac{11 \cdot 4}{16 \cdot 33} = \frac{44}{528} = \frac{1}{12}\]

3. \[\frac{7}{10} \cdot \frac{5}{21} = \frac{7 \cdot 5}{10 \cdot 21} = \frac{35}{210} = \frac{1}{6}\]

4. \[\frac{12}{100} \cdot \frac{50}{12} = \frac{12 \cdot 50}{100 \cdot 12} = \frac{600}{1200} = \frac{1}{2}\]

5. \[\frac{14}{32} \cdot \frac{64}{7} = \frac{14 \cdot 64}{32 \cdot 7} = \frac{896}{224} = 4\]

№4

1. \[2\frac{1}{2} \cdot \frac{2}{5} = \frac{5}{2} \cdot \frac{2}{5} = \frac{5 \cdot 2}{2 \cdot 5} = \frac{10}{10} = 1\]

2. \[3\frac{1}{2} \cdot 1\frac{1}{2} = \frac{7}{2} \cdot \frac{3}{2} = \frac{7 \cdot 3}{2 \cdot 2} = \frac{21}{4} = 5\frac{1}{4}\]

3. \[1\frac{1}{3} \cdot 2\frac{1}{4} = \frac{4}{3} \cdot \frac{9}{4} = \frac{4 \cdot 9}{3 \cdot 4} = \frac{36}{12} = 3\]

4. \[1\frac{1}{2} \cdot \frac{2}{3} = \frac{3}{2} \cdot \frac{2}{3} = \frac{3 \cdot 2}{2 \cdot 3} = \frac{6}{6} = 1\]

5. \[2\frac{1}{5} \cdot 2\frac{3}{11} = \frac{11}{5} \cdot \frac{25}{11} = \frac{11 \cdot 25}{5 \cdot 11} = \frac{275}{55} = 5\]