Ⅰ Rational numbers and recurring decimals

Lesson 1: Recurring Decimals / Lesson 2: Rational Numbers that Can Be Expressed as Finite Decimals /
Lesson 3: Representing Fractions of Recurring Decimals

Calculation of Formula II

Lesson 4: Exponent Laws / Lesson 5: Multiplication and Division of Monomials / Lesson 6: Addition and Subtraction of Polynomials /
Lesson 7: Calculating Monomials and Polynomials

Ⅲ First-order inequality

Lesson 8: Inequalities / Lesson 9: Solutions to Various Linear Inequalities / Lesson 10: Applications of Linear Inequalities

Ⅳ Simultaneous linear equations

Lesson 11: Systems of Linear Equations and Their Solutions / Lesson 12: Solutions to Various Systems of Linear Equations /
Lecture 13: Special Systems of Linear Equations / Lecture 14: Applications of Systems of Linear Equations

Ⅴ Linear functions and their graphs

Lesson 15: Functions / Lesson 16: The Meaning and Graph of Linear Functions / Lesson 17: Intercept, Slope, and Slope
Lesson 18: Properties of Graphs of Linear Functions / Lesson 19: Equations and Applications of Linear Functions /
Lesson 20: Linear Functions and Linear Equations / Lesson 21: Graphs of Linear Functions and Solutions to Systems of Linear Equations

The core concepts of the first semester of the second year of middle school mathematics are divided into 21 lectures to enable quick and accurate learning, and the concepts are repeatedly confirmed through twin problems.
We also provided examples of incorrect answers to help you review concepts that are easy to confuse or mistakes that are often made.