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If x represents the number here, we can use 5x to represent 5. For example, 5 people can be represented by 5x people, 5 a can be represented by 5xa, 5 can be represented by 5×9, and the answer should be (1). If x represents multiplication here, then the title of this question should be changed from 5 9 to 5 9 plus. At this time, it depends on how the teacher agrees with the students in the clas* how to five nine plus. I have mentioned in other parts of this article that there is no global regulation for the use of this symbol. Different countries have different notations. Taiwan uses 9x 5 to express it, which is the correct answer in this article (3). Professor Wei Zeren from the Department of Applied Mathematics of Donghua University added: Draw in the same way as the fourth method, then observe the lengths of the bottoms of the two triangles fixed, and then fight together. Another angle is to ask, why can this topic be asked? That is why you know the area by knowing the four sides. Can the shape be determined in addition to the area? From here, there are many ideas to restore the essence of the problem. This book also gives an evaluation of the history of mathematical modeling. If the reader has fully understood the spirit of mathematical modeling, it will be found that it is also a kind of modeling. It is an easy way to evaluate the student's journey. But teachers must understand that this is definitely not to be a high level, to remind students where else to do better. Do you want to give a score to add up, is it to make it easy for everyone to line up a line? Is it easy to go to school? Is it so that everyone wants to compare Beethoven with Monnet? Therefore, at the end of the book, the reader is reminded that mathematical modeling is an art and a taste. In fact, everyone can have a different understanding of it. For me, it can be a luxury of life, a collectible. With it, math is wonderful! With it, life is rich! The math clas* is no longer a digital race in paper and pen cages; it allows you to clear your mind and filter out a mathematical beauty even if you hear the sound of rain. 1 Reverberation Under the as*umption that the sentiment function is continuous, this is impossible. Wel Stras* extremum value