【洋葱数学是哪个国家的品牌？】

英文翻译：Yangcong345: onion mathematics frequency teaching network is a platform that focuses on providing original mathematics video teaching content for junior high school students. It analyzes the content layer by layer and understands it as soon as you learn, so that you can say goodbye to the inefficient and boring learning mode, and help students master learning skills through the interesting and inspiring mode.

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