а) \(4\ \text{м}^3=4000\ \text{дм}^3\); \(900\ \text{л}=900\ \text{дм}^3\); \(50\,000\ \text{см}^3=50\ \text{дм}^3\); \(200\,000\ \text{мл}=200\ \text{дм}^3\); \(12\ \text{м}^3 21\ \text{дм}^3=12\,021\ \text{дм}^3\).
б) \(18\ \text{км}^3=18\,000\,000\,000\ \text{м}^3\); \(3000\ \text{дм}^3=3\ \text{м}^3\); \(10\,000\,000\ \text{см}^3=10\ \text{м}^3\).
в) \(8760\ \text{дм}^3=8\ \text{м}^3 760\ \text{дм}^3\); \(20\,020\ \text{дм}^3=20\ \text{м}^3 20\ \text{дм}^3\); \(72\,450\,000\ \text{см}^3=72\ \text{м}^3 450\ \text{дм}^3\).