13т 32кг-12т 31кг

To subtract 12t 31kg from 13t 32kg, you need to perform the subtraction of both the tons and the kilograms separately.

First, subtract the tons:

13t - 12t = 1t

Next, subtract the kilograms:

32kg - 31kg = 1kg

Therefore, the result is 1t 1kg.