Postgraduate entrance examination mathematics, postgraduate entrance examination subjects, according to the different requirements of various disciplines and majors on the mathematical knowledge and ability that postgraduate entrance examination should possess, there are three kinds of postgraduate entrance examination mathematics papers, and the types of papers used by different majors have specific provisions.

Mathematics 1 65.69, the difficulty coefficient is 0.438, which is too difficult.

Mathematics 2 is 7 1.87, with a difficulty coefficient of 0.479, which is slightly higher.

Math III is 76.80, with a difficulty coefficient of 0.5 12, and the difficulty is moderate.

Examination requirements 1:

1. Understand the concepts of population, simple random sample, statistics, sample mean, sample variance and sample moment.

2. Understand variables, variables and typical patterns of variables; Understand the standard normal distribution, distribution and upper quantile of distribution, and look up the corresponding numerical table.

3. Grasp the sampling distribution of sample mean, sample variance and sample moment of normal population.

4. Understand the concept and properties of empirical distribution function.

Test requirement 2:

1. Understand the concepts of convergence and sum of convergent constant series, and master the basic properties of series and the necessary conditions for convergence.

2. Master the conditions of convergence and divergence of geometric series and P series.

3. Master the comparison of convergence of positive series and the ratio discrimination method, and use the root value discrimination method.

4. Master the Leibniz discriminant method of staggered series.

5. Understand the concepts of absolute convergence and conditional convergence of arbitrary series and the relationship between absolute convergence and convergence.

6. Understand the concept of convergence radius of power series and master the solution of convergence radius, convergence interval and convergence domain of power series.

7. Knowing the basic properties of power series in its convergence interval (continuity of sum function, item-by-item derivation, item-by-item integration), we find the sum function of a power series in its convergence interval, and then find the sum of a series.

8. We have mastered the Maclaurin expansions of the power of e to x, sin x, cos x, ln( 1+x) and (1+x) to a, and we will use them to indirectly expand some simple functions into power series.