8) 2 2/5 : 2/7 = (2 × 5 + 2)/5 : 2/7 = (10 + 2)/5 : 2/7 = 12/5 : 2/7 = 12/5 × 7/2 = (12 × 7)/(5 × 2) = (6 × 2 × 7)/(5 × 2) = (6 × 7)/5 = 42/5 = 8 2/5
Ответ: 8 2/5