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Is teacher Dong Haiyang's class useful?
Useful. According to Baidu query, Dong Haiyang's disciple class is useful for the following reasons:

1. Teacher Dong Haiyang's teaching style is humorous, focused and easy to understand, which helps to improve mathematical thinking and problem-solving ability.

2, Dong Haiyang disciple class is to master some knowledge points and learn some skills, which is beneficial. The content includes oral refueling package, word disclosure and grammar advancement.