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Why do you usually use abc in front of the known number and xyz in the back to represent the unknown number?
In order to write mathematical formulas with symbols and express them concisely. Vader, a French mathematician, is the Vader who put forward the relationship between root and coefficient in junior middle school mathematics by Vieta theorem (he is a lawyer, a member of parliament, and studies mathematics as an amateur, just like Fermat). He first proposed to use consonant letters, such as B.C., to represent known quantities, and vowel letter A to represent unknown quantities. However, in the process of use, it is very inconvenient to judge whether it is a consonant or a vowel every time. It's best to describe it in words. Later, Descartes, a great mathematician who invented rectangular coordinate system, optimized the expression. The front letter abc means known, and the back letter XYZ means unknown, which is clear at a glance, simplifying the symbol record. Later, it was accepted and used by mathematicians and has continued to this day.

Everything happens for a reason, and you can't act rashly with regulations.