1. According to Sohu News Network, Euler Junior High School Mathematics is an education and learning class under Beijing Youchang Technology Co., Ltd. The Euler Junior High School Mathematics website requires users to register and purchase members to obtain complete course content and learning resources.

2. The members of Euler Junior Middle School Mathematics include ordinary members, senior members and flagship members, which correspond to different prices and different service contents. After purchasing membership, users will get a series of mathematics learning materials and high-quality mathematics courses, which can help students learn mathematics knowledge. Therefore, it is necessary for Euler to buy a member in junior high school mathematics.