General term formula of arithmetic progression formula
For example, given the series 1, 4, 7, 10…, which item 58 should I ask?
a、20B、 18C、 19D、2 1
Analysis: First, identify the characteristics of the questions. The obvious feature of arithmetic progression's questions is that there are differences between two adjacent items, and the differences are equal. By observing the known series, we can know that the difference between two adjacent items is 3, which belongs to the test center in arithmetic progression. The first term is 1, and the tolerance is 3. The question asked is which item is 58, which is equivalent to finding the nth item of arithmetic progression. According to the general formula, 1+3*(n- 1)=58, and the solution is n=20, so choose option a.
Arithmetic progression's formula arithmetic progression has its own characteristics, and the difference between two adjacent numbers remains unchanged.
If you want to reduce the tolerance bit value, divide it by the bit difference to calculate it.
Head and tail and half, multiply by the number of digits and then operate.
Mixed editing is difficult to summarize, and the dislocation transformation is skillfully eliminated.
Gauss algorithm complement length, separate operation, connection.
Learning methods of high school mathematics 1. Mathematics study time should account for about 50% of all subjects;
Regardless of arts and sciences, mathematics is a time-consuming and laborious subject. For liberal arts and science, the score of mathematics in the college entrance examination is the most important. For example, in liberal arts, it is rarely heard that the comprehensive score of a course can be as poor as 60 points, but it can be as poor as 60 or 80 points in mathematics.
For science, physics and chemistry, a lot of calculations are needed, and mathematics learning provides a tool and thinking. Therefore, mathematics is very important for the former arts and sciences, or for the partial arts and sciences after the abolition of arts and sciences now.
Second, every math problem is worth doing three times;
You have to do every math problem (except the very simple one) three times. 1 is to do it normally, and then modify the answer according to the reference answer and problem-solving ideas.
Doing it a second time usually works best the next day. Do all the previous questions quickly. This "doing" and 1 are not exactly the same time, and it is counted from beginning to end. But to sort out the key steps and key ideas. Do it for the third time, preferably after 7 days. After seven days, do it again at this time and you will feel suddenly enlightened.
Third, you should have a record book of your own mistakes;
The meaning of the wrong question book is not to copy down every question you make wrong, but to save those questions that are wrong again and again. The essence of the wrong question book is a revision of our way of thinking and habits. The questions in this wrong book should all be wrong after three times.