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How to improve the speed of doing mathematical calculations?
1, it is very difficult to solve the calculation problem in three days. Without quick math study, it will take three days to solve it. Practice more at ordinary times. You can't be lazy when you do the problem. You can't just look at it and think you understand it, so it's hard to improve. If you count more, the speed will be faster, just like typing. If you play too much, you will be familiar, and your hands will have inertia. It will be soon. Calculation is the foundation. Primary schools should have a lot of skills to learn calculation. You can't lose them. And mathematics also pays great attention to summarization. Each type of different solutions should be summed up, and then practiced, practiced, practiced ... over and over again.

2, if it is imminent, you can only relax, be careful when doing the problem, and don't be sloppy in calculation. I don't know how old you are. I just graduated from high school. Based on my long-term experience, I can remind you that sometimes you have to give up, but if you choose to fill in the blanks, you will never be blank, and you will get one if you can't write or you can't figure it out. For example, fill in the blank, you can ask for a certain angle, you can choose a special angle, 30, 45, 60, 90. If I really can't figure it out, I usually write π/3. Multiple choice questions are easier to guess, you know. Some questions are also very deceptive, and there is no need to calculate them at all ... Write down all the big questions that you can't do, there is nothing to worry about, and where can you solve them. It is the right way to leave more time for the problems you can do!