17 is solid geometry. Most people understand the first question, and the next question is more difficult. This is a question of distance score, which needs more time.
18 The combination of analytic geometry (conic curve) and straight line. The first problem generally solves the standard equation of conic curve, which can be solved according to one or two conditions. The second problem is more troublesome, which generally combines functional knowledge and inequality.
The quadratic function of the problem 19 is to find monotonicity and extreme value, so a table is usually drawn.
20 probability questions can be scored as long as you understand the meaning of the questions. Don't worry about this problem, but do it seriously.
2 1 is a comprehensive problem, which will definitely use the knowledge of sequence, require recursive relation, mathematical induction, be very skillful and require a large amount of calculation.
Do it carefully when you do the problem, take all the points you deserve, and then the score will be high! I wish you success in the college entrance examination!