[1].
Use of characters

1.
Any number □ is x
2.
Use of characters
3.
Use of parentheses
4.
Omission of the multiplication symbol x (1)
5.
Omission of the multiplication symbol x (2)
6.
Omission of the division sign ÷
7.
Simplify complex equations
8.
The value of the expression
Unit conclusion

[2].
Addition and subtraction of equations

1.
ceremony
2.
- to +, ÷ to x
3.
Addition of equations
4.
Like terms and degrees (1)
5.
Like terms and degrees (2)
6.
coefficient
7.
port
8.
Monomials and polynomials
9.
Classification of food
10.
Expression for character x
Unit conclusion

[3].
Multiplication and division of linear equations

1.
Multiplication of simple linear equations
2.
Distributive Law (1)
3.
Distributive Law (2)
4.
Substitute the equation
5.
Calculating fractional expressions (1)
6.
Calculating fractional expressions (2)
7.
Organizing complex equations
Unit conclusion
Answer and explanation

1.
Contains the principles of calculation!

The principles of addition, subtraction, multiplication, and division learned in elementary school and those learned in middle school are the same.
Therefore, children can sufficiently solve the principles of equations containing letters by using the principles of operations they learned in elementary school.
Since the definition of addition or subtraction does not change just because an expression contains letters, the same principle can be applied when calculating an expression.
In this way, it fully embodies the principle of consistent calculation that “the concept of calculating a first-order equation comes first.”

2.
Unraveling the meaning of terms!

In the calculation part of the equation, many new terms appear to explain each element and part of the equation.
However, if you look at the meaning of confusing terms such as coefficient, degree, like term, and constant term one letter at a time in Chinese characters, you can easily understand the overall meaning of the word.
This book gradually unravels mathematical terms, starting with the meaning of letters, conveying meaning in everyday terms, and finally reaching a rigorous definition of mathematics.
That's why you don't just memorize the definitions of terms, you understand them and remember them naturally.
Check out the explanation of magical mathematical terms in the book, "The Concept of Calculating Linear Equations Comes First"!

3.
Present the basis of logic!

Because mathematics is structured hierarchically, if there is a hole at any stage, it can be difficult to build new knowledge in later stages.
It may be okay now, but over time, this will create gaps in your logical thinking, which will hinder your ability to learn math properly.
In order to fill in such gaps, 『The Concept of Calculating Linear Equations Comes First』 has structured the content tightly, presenting logical grounds even for the smallest details.

4.
Intuitive images help you understand concepts at a glance!

You might think a book that explains abstract mathematical concepts in a mathematical way would be difficult? Not so! This book explains concepts in a way that's easy for learners to grasp and remember.
The content is developed with interesting materials and pictures, and the intensity of the content is effectively expressed so that important information can be seen at a glance.
Discover "The Concept of Linear Equations Comes First," a book with an intuitive design that allows you to grasp concepts at a glance, rich explanations, and comprehensive problems.

5.
The world's kindest answer sheet!

Even though we know how to solve a problem, there are more cases than you might think where we make mistakes in calculations.
And sometimes, when you're so absorbed in calculating something, you forget what you were calculating.
Here's a special answer sheet to help you answer all the questions you know.
The entire calculation process is detailed, as if the teacher had solved it by hand, and various clues hidden in the problem are highlighted with colors and arrows, so that you can intuitively know how to use them at which stage.
Let's take our friends' problem-solving skills to the next level by referring to the friendly explanation in "The Concept of Calculating Linear Equations Comes First."

6.
Free video lectures so you can study on your own!

This book provides video lectures on every page from beginning to end.
Because it includes complete concept explanations and problem-solving, you can study the entire book along with the lectures, or you can use the lectures to only cover the parts you need.
You can view the lecture immediately by scanning the QR code without separate registration, and you can access more learning materials by visiting Mathbus (www.mathbus.co.kr).
Have fun studying with a former EBS teacher's cheerful, refreshing, and exhilarating lectures!

★★★ Great for students like this!
*Students who are good at finding answers, but don't know the concept when asked about it
*Students who seem to know, but don't know how to solve slightly difficult problems.

★★★ A math book worthy of being called math!!
Mathematics is often said to be beautiful because it presents the content in a clean and uncluttered way.
A math book that helps you think mathematically! Check it out now.

★★★ A book that proves that math books can be pretty too!!!
A math book with a pastel-toned layout that resembles a fairy tale has been published, unfolding mathematical concepts through illustrations.
Add fun to your studies with these pretty math books.