Li Yongle, 1983 was born in Jilin City, Jilin Province. He is a high school math physics teacher, an exclusive creator of watermelon video, a bachelor of physical economics in Peking University and a master of electronic engineering in Tsinghua University. Many people will choose Li Yongle's three-piece math review when they take the postgraduate entrance examination.

Remind everyone that in the review process, we must accurately master the basic concepts, methods and theorems of mathematics according to the outline. Because only by deeply understanding the basic concepts and firmly remembering the basic theorems and formulas can we find the breakthrough and breakthrough point of solving problems.