The difficulty of national volume 2 is the first, and the difficulty of 20 17 national volume 2 is "crooked".

The crooked place is that the topic is not new, and the amount of calculation is quite large (18 is a big problem in probability theory and mathematical statistics, and the big problem in the front and back is not difficult, but it is easy to collapse after finishing this problem)

Therefore, this paper should be easy for students who have some calculation training.

Compared with simple questions, fill in the blanks completely with basic choices ...

Questions that may be scored:

The last question of multiple-choice questions establishes a coordinate system for vector calculation, and the sky turns blue immediately ... The result is still a calculation!

The penultimate question in the blank is the crack.

Fill in the blanks. After drawing the picture, the result still becomes a calculation problem. ...

The triangle problem is the foundation.

Conic curves and solid geometry are also ideas, depending on your careful calculation.

It is not difficult to calculate the final derivative, but (1) must have a limit idea; (2) It is classified discussion. You prove that there is a unique maximum point, and the problem is over.

The multiple-choice questions of coordinate system and parametric equation have the skills of multiplication and difference ... Inequality multiple-choice questions are also routines, but they are proof questions, so they are more difficult than coordinate system questions. ...

Therefore, this paper is really not difficult, serious questions and questions are not serious, and the amount of calculation is slightly larger.