1,3-1

It seems like you're referring to the expression "1,3-1." This can be interpreted in different ways depending on the context. If you're referring to a mathematical expression, it might need clarification.

If you meant to represent a subtraction:

1. If it’s just a simple arithmetic operation: \[ 1.3 - 1 = 0.3 \]

If you meant something else, please clarify so I can assist you better!