This is necessary. Bi Ye is a junior high school math teacher, helping with homework. Graduated from Beihang University, he is the pioneer of mathematics curriculum in junior and senior high schools in homework help, and the teaching principal of Chengdu Branch in homework help. Bi Ye's mathematics course has improved rapidly after learning, and its teaching style is humorous, which can help children improve their grades and consolidate their foundation, so it is necessary to apply.