The definition of a fraction is that if A and B represent two algebraic expressions and B contains letters, then the formula A/B is called a fraction. Score is one of the key contents in junior high school mathematics, and the examination of its related knowledge in senior high school entrance examination mathematics has always been a hot spot.

On the classification of equations;

1. One-dimensional linear equation: An integral equation with only one unknown number 1 is called a one-dimensional linear equation. The usual form is ax+b=0(a, b are constants, a≠0).

2. Binary linear equations: Definition of binary linear equations: An equation group consisting of two binary linear equations is called binary linear equations.

3. One-dimensional quadratic equation: an integral equation with unknown number, and the highest degree of unknown number is 2. Such an equation is called an unary quadratic equation.