Why is there error when number backslash zero/

Question

Calculations

Answer 1

the question is quite cryptic but if I understand you correct:
\ is a backslash and does not work in mathematics. it is often used to bypass code or deal a code of command, such as
" \n " == row break or 'test\'s backslash' ( thisdoes not break the print string thx to the backslash.
In maths however:
the classic slash '/' and '//' works just fine.

I guess this is what you meant?
Hope it helped.

Dr.

Answer 2

please explain