Do the indicated operation. Convert the result in liters.
1) 10 000mL – 7 000 mL
2) 2 000 mL + 9 000 mL
3) 6 000 mL – 5 000 mL
4) 7 000 mL + 3 000 mL
5) 5 000 mL + 8 000 mL