2. Найдите произведение: a) 1$$\frac{9}{28}$$ × 7 = (1 + $$\frac{9}{28}$$) × 7 =

а) $$1\frac{9}{28} \times 7 = (1 + \frac{9}{28}) \times 7 = 1 \times 7 + \frac{9}{28} \times 7 = 7 + \frac{9 \times 7}{28} = 7 + \frac{9}{4} = 7 + 2\frac{1}{4} = 9\frac{1}{4} = 9,25$$

Ответ: 9,25