Цель: понять сам принцип. 1) (3/5 + 2/5) × 1/3 2) (7/8 - 3/8) × 4 3) 5 × (2/7 + 3/7) 4) (5/6 + 1/6) × 3/4 5) (9/10 - 3/10) × 5/6

1) $$\left(\frac{3}{5} + \frac{2}{5}\right) \times \frac{1}{3} = \frac{5}{5} \times \frac{1}{3} = 1 \times \frac{1}{3} = \frac{1}{3}$$

Ответ: 1/3

2) $$\left(\frac{7}{8} - \frac{3}{8}\right) \times 4 = \frac{4}{8} \times 4 = \frac{1}{2} \times 4 = 2$$

Ответ: 2

3) $$5 \times \left(\frac{2}{7} + \frac{3}{7}\right) = 5 \times \frac{5}{7} = \frac{25}{7} = 3\frac{4}{7}$$

Ответ: $$3\frac{4}{7}$$

4) $$\left(\frac{5}{6} + \frac{1}{6}\right) \times \frac{3}{4} = \frac{6}{6} \times \frac{3}{4} = 1 \times \frac{3}{4} = \frac{3}{4}$$

Ответ: 3/4

5) $$\left(\frac{9}{10} - \frac{3}{10}\right) \times \frac{5}{6} = \frac{6}{10} \times \frac{5}{6} = \frac{3}{5} \times \frac{5}{6} = \frac{1}{1} \times \frac{1}{2} = \frac{1}{2}$$

Ответ: 1/2