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How to use a ruler?
About using a ruler to draw a video tutorial link sharing: web link.

The methods about how to learn math well are as follows:

1, math should also be memorized: recite the table of contents and recite the wrong questions. The exam is a time-limited exam, so there is no time for you to recall the formulas in the math textbook bit by bit in the examination room. The best way is to memorize the formula and the derivation process, so that you can reflect which formulas he wants to use in the first time.

2, you can also recite the wrong questions. In fact, in junior high school mathematics, there are only a few kinds of questions corresponding to each knowledge point. You can recite the wrong questions of classic examples yourself, and one or two of each type is enough. Just follow the condom during the exam.

3, sort out the wrong questions, dig deep into the root of the problem to find the reason for the wrong questions. How did Xueba use the wrong title? They will "get to the bottom of the wrong question", find out their own fault, whether they are careless, or which knowledge point was unexpected or correct, and mark the wrong reason next to the wrong question. Then review these wrong questions regularly to avoid tripping over the same question many times.

4. Follow the teacher's ideas in class. Try to follow the teacher's ideas in class, try to keep up with what you can, circle up and put down what you don't understand for the time being, and then continue to follow the teacher's ideas. After class, talk with teachers or classmates to understand the difficulties marked by yourself. As for the notes, you should remember that you can understand them without pursuing beauty. This is formalism.

For students who are interested in mathematics, the process of solving problems is like a writer writing and a chef cooking, immersed in it. Many students, especially those who don't like math, are like mountains that make people breathless.