ж) \(9\frac{3}{8} \cdot 2\frac{5}{7} - 2\frac{5}{7} \cdot 7\frac{3}{8}\)

Решение:

Используем распределительное свойство умножения: (a \(\cdot\) b - a \(\cdot\) c = a \(\cdot\) (b - c))

(9\(\frac{3}{8}\) \(\cdot\) 2\(\frac{5}{7}\) - 2\(\frac{5}{7}\) \(\cdot\) 7\(\frac{3}{8}\) = 2\(\frac{5}{7}\) \(\cdot\) \(9\frac{3}{8} - 7\frac{3}{8}\) = 2\(\frac{5}{7}\) \(\cdot\) \(9 - 7 + \frac{3}{8} - \frac{3}{8}\) = 2\(\frac{5}{7}\) \(\cdot\) 2 = \(\frac{19}{7}\) \(\cdot\) 2 = \(\frac{38}{7}\) = 5\(\frac{3}{7}\))

Ответ: \(5\frac{3}{7}\\)