Onion mathematics can make it easy to learn and master knowledge and make learning more efficient. Onion math software combines video and exercise training, which is easier to remember and can quickly improve students' math learning ability.
Some students not only sort out their own wrong questions, but also sort out "easy-to-mistake questions", "difficult questions", "typical questions" and "good questions" in the process of using the wrong question book, which is called "good question book"