6 liter+8m³-160dl=........liter

6 liter = 6 liter
8 m³ = 8000 liter
160 dl = 16 liter

6 + 8000 - 16 = 7990 liter

6 liter + 8 m^3 - 160 dl = liter

6 + (8×1.000) - (160÷10)

6 + 8.000 - 16

7.990 liter