I really think Zhang Yu is very good. Many topics in this year's postgraduate entrance examination are revealed in Ge's shadow. . . Really, I did math this year. I chose to fill in the blanks, and then I got stuck in the big problem of online generation probability, and then I really wanted to cry. Later, I did five big questions with high numbers, which went very smoothly. In fact, I mainly used Taylor formula advocated by Hugo to solve the limit problem of the first big problem in seconds, and used rotational symmetry and express solution mentioned by Hugo to solve the second double integral. These two problems stabilized my mood, and then I solved all the big problems. . .