There is no need to write 1000. 2020 edition 1000 is the latest typesetting. I hesitated when I first started writing 1000. Later, I bought a book and found that the limit question on the first page was very new. I had never met it before, so I went to into the pit. When it's time to brush the real questions in the sprint part, coupled with the postgraduate entrance examination this year, well, this type of seeking the limit has never appeared once. Except for Zhang Yu's book, this kind of question can hardly be seen in the market. So, don't brush, brushing is a waste of time.

Students who want to brush 1000 questions, stop! The topics of postgraduate mathematics are very mature, and there are so many question banks. Basic questions and routine questions will be found in any exercise. No wonder 1000 is off-topic, so there is no need to write it. This kind of difficulty is different from the difficulty of postgraduate entrance examination. The difficulty of postgraduate entrance examination is that you have ideas, but you just can't write them. The test is about your proficiency, and the difficulty of the question 1000 is that you never expected to start like this, and suddenly you understand the answer. If you want to use Zhang Yu's questions, I recommend closed practice. The above questions are all quite good.

The basic questions of 1800 are moderately difficult. If your goal is 985, then your correct rate must be above 80%. What do you mean, for example, there are ten big questions in the limit, and some big questions contain small questions. You must ensure that the eight questions are completely correct. 1800, it is quite difficult to write. The shortcomings of Tang Jiafeng's problem are many problems, limit, derivative and integral. Write all the suggestions. After all, this is the foundation. It is necessary to write more questions. It is suggested that all the big questions should be written in the proof part of the mean value theorem, and the other parts should be written as much as possible according to their own situation.