First of all, let's understand that Roman numerals use seven Roman letters as numbers, namely I (1), X( 10), C( 100), M( 1000), V(5) and L(50). In addition, the number 0 in Roman numerals is replaced by spaces!

You can learn from your own encyclopedia!

So the Roman numeral 2003.0 1.09 is written as: 2003 mmiio 1 i09 IX.

In addition, I will add 13 14,520: mcccxiv (1314), dxx (520).

If you are satisfied with my answer, please adopt it as soon as possible. Thank you!