nostr:npub1c9vmvl675evtcvve432fch2sy3msck8de2cmgacd4e83w88nc4aqsuyvjy 
According to this mathematician, that practice is antiquated. In his words, "Today this practice is discouraged, and I have never seen a mathematician write an ambiguous expression using the division symbol. Textbooks always have proper parentheses, or they explain what is to be divided. Because mathematical typesetting is much easier today, we almost never see ÷ as a symbol, and instead fractions are written with the numerator vertically above the denominator."

https://mindyourdecisions.com/blog/2016/08/31/what-is-6%C3%B7212-the-correct-answer-explained/