2. Решить пропорции.

а) x/14 = 4/7 => x = (4 × 14) / 7 = 8. б) x/6 = 98/21 => x = (98 × 6) / 21 = 28. в) 45:5x = 9:4 => 5x = (45 × 4) / 9 = 20 => x = 4. г) 4:2 = 2/7 : 5/8 => (2/7) × (8/5) = 16/35, что верно.