The 2023 postgraduate entrance examination has come to an end, and some students are more interested in this year's test center, so here, we will analyze and explain the double integral. Double integral is a common test center for students of number two, but number three is also favored in recent years, so the following is an analysis of number three 19.

This topic fully embodies the calculation steps (test sites) of double integral: image, symmetry, rectangular coordinate system/polar coordinate system. In addition, the idea of decomposition and merger is used to transform it into an easy-to-calculate area, and the flexible application of knowledge points is investigated.

It can be seen from this topic that the examination is mainly based on examination, and most of them are the examination of basic concepts, basic theories and basic methods. As long as candidates pay attention to these three aspects in the usual review, they will certainly do well in the exam, but they should also remind the students who are going to take the exam next: prepare early, because it has a large number of questions, and some questions are really not retarded. These 22 questions not only need you to do, but also need you to make the best choice in the shortest time. I hope everyone will continue to work hard and grasp all stages of review. ?

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