The infinite cycle of 0.99 is 1, according to the formula: a11-q; Brought in: 0.9/(1-0.1) =1; So 1=0.99 infinite loop. Infinitely circulating decimals in the fifth grade continuously generate decimals. Infinitely circulating decimals repeat the previous digit or the previous section from a certain digit after the decimal point. Such as 2. 1666…, 35.23 …, and so on. Some decimals are infinite, but they are not cyclic. Irrational numbers are not like circular decimals. Every number is repeated, but it is also an infinite decimal.
A summary of mathematics learning methods
First, pay attention to the lecture in class and review it in time after class.
The acceptance of new knowledge and the cultivation of mathematical ability are mainly carried out in the classroom, so we should pay special attention to the learning efficiency in the classroom and seek correct learning methods. In class, you should keep up with the teacher's ideas, actively explore thinking, predict the next steps, and compare your own problem-solving ideas with what the teacher said. Finish your homework independently and be diligent in thinking. For some problems that are difficult to solve for a while because of their unclear thinking, let yourself calm down, analyze the problems carefully and find ways to solve them by yourself.
Second, do more questions appropriately and develop good problem-solving habits.
It is necessary to learn mathematics well, do more problems and be familiar with the problem-solving ideas of various types of questions. At the beginning, we should start with the basic problems, take the exercises in the textbook as the standard, lay a good foundation repeatedly, and then find some extracurricular exercises to help broaden our thinking, improve our ability to analyze and solve problems, and master the general rules of solving problems.
Third, adjust the mentality and treat the exam correctly.
Adjust your mentality, let yourself calm down at any time, think in an orderly way, and overcome impetuous emotions. Be prepared before the exam, practice routine questions, expand your own ideas, and improve the speed of solving problems on the premise of ensuring the correct rate. For some easy basic questions, you should have a 12 grasp and get full marks; For some difficult questions, we should also find ways to get points, so that our level can be normal or even extraordinary in the exam.