1 and 1kg are equal to 2kg, and the mathematical expression is: 1kg = 1kg = 2kg (500g).

2. 1 kg = 0.00 1 ton;

3. 1 kg = 1 1,000 g =2 kg;

4. 1 kg = 1 1,000,000 mg;

5. 1 kg = 1 1,000,000,000 micrograms;

6. 1 kg) = 2.205 lbs;

7. 1 gold = 10 beam = 100 yuan;

8. 1 kg = 0.5 kg (kg) = 500 g.