1, coefficient (mbth coefficient), refers to the numerical factor in the single item of algebraic expression. The sum of the exponents of all the letters in a monomial is called its degree. Usually the coefficient is not 0, it should be a rational number.

2. For example, the social relationship to be reflected is 3x = y, where x represents the basic situation (population, resources and other facts), and different countries have different situations, and 3 represents that number system.