Without Li Yang, only Pei can strengthen the integral. According to the inquiry of postgraduate courses, scores can be given directly to students, and Li Yang's reinforcement is not needed. Candidates have strong learning ability and do not need reinforcement. Fraction is a basic course for college mathematics majors. The branch of analysis in mathematics is a branch of mathematics that specializes in real numbers, complex numbers and their functions. Its development begins with calculus and extends to the continuity, differentiability and integrability of functions.