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Mathematical problems in civil service examination
This is the topic of graphic analysis of the test questions.

The third problem is to find the rule of the number of straight line segments in each graph, which are 3, 4, 5, 6 and 7 respectively.

Question 4: Similarly, to find the number of curves in each graph, the observation rule is 1, 2, 3, 4, and then 5, because it is unclear, the answer should be that D contains 5 curves.

Question 5: Find the angles contained in each graph, which are 1, 3, 5, 7, 9, followed by 1 1, and the answer is C.

Question 6: This question is a bit difficult because there are many factors to observe. Vertically, the sum of the points contained in the first two graphs in each column is the point of the third graph, from which it can be concluded that the last graph in the third column contains two points. Looking horizontally, the number of angles included in each pattern is the first row 3, 4, 5, the second row 4, 4, 4, and the third row 7, 8. It is concluded that the last pattern includes 9 angles, and D is selected comprehensively.

In fact, there are only a few common types of such topics. Do more and then summarize, and you can touch it.