1. Найдите произведение: а), б), в)

а) 1/8 × 9 × 1/3 = (1×9×1)/(8×3) = 9/24 = 3/8. б) 3/8 × 4/9 = (3×4)/(8×9) = 12/72 = 1/6. в) 3/10 × 2/7 × 1/5 = (3×2×1)/(10×7×5) = 6/350 = 3/175.