1. Understand the concept of unary quadratic equation: unary quadratic equation refers to an equation with only one unknown and the highest degree of the unknown is 2. For example: ax 2+bx+c = 0.
2. Grasp the basic properties of the quadratic equation with one variable: the quadratic equation with one variable has four coefficients A, B, C and D, where A, B and C are not 0. When a, b and c are all positive numbers, the equation has two real roots; When one of A, B and C is negative, the equation has no real root; When two of a, b and c are negative numbers, the equation has two * * * yoke complex roots.
3. Learn to use the formula method to solve the quadratic equation of one yuan: the formula method is a common solution to the quadratic equation of one yuan, which uses the root formula of the quadratic equation of one yuan. The formula for finding the root is: x = (-b√ (b 2-4ac))/2a. Substituting known a, b and c into the formula, the solution of the equation can be calculated.
4. Learn to solve the quadratic equation with one variable by factorization: Factorization is another common method to solve the quadratic equation with one variable. It factorizes the left side of the equation to get two linear equations, then solves the two linear equations respectively, and finally adds or subtracts the two solutions to get the solution of the original equation.
5. Do more exercises: Learning mathematics requires more exercises to consolidate what you have learned. You can practice by doing exercises in textbooks, participating in math competitions or searching related topics on the Internet.
In a word, to learn the solution of the first volume of ninth grade mathematics, we need to understand the concept, master the basic properties, learn to use the formula method and factorization method, and consolidate the learned knowledge by doing more exercises.