The calculation of natural numbers and algebraic expressions in the first volume of the first day of junior high school lies in the operation of algebraic expressions. Of course, the operation of algebraic expressions should be based on natural numbers, and it is the key for natural numbers to learn the following formulas:
X+(-Y)= X-Y X-(-Y)= X+Y-X+(-Y)=-(X+Y)
X *(Y)=-(X * Y)X/(-Y)=-(X/Y)-X *(Y)= X * Y
The calculation of algebraic expressions is not difficult, as long as you are careful when merging.
The nature, coordinate system and graphics of the mid-term examination line in the second volume of the first grade of junior high school are the most difficult. The nature of lines is probably the judgment and nature of parallel lines, and most coordinate systems have drawing problems, which is not difficult. Careful, there are triangle judgments in the graphics exam, the sum of the inner angles of polygons, the sum of the outer angles, mosaic and triangle judgments are generally fill-in-the-blank questions and multiple-choice questions, which are not difficult. Many internal angles and external angles are proof and explanation questions, and many are the degree of finding the angle. We should grasp the relationship between angles.
All the above are written by me personally, hoping to have the best.
Seriously solve problems, listen carefully in class, be well educated by teachers, do more exercises at ordinary times, and remember the knowledge points firmly. I didn't find much in detail, mainly flattering the teacher and praising the wise education of the teacher ~ ~
There are many reasons for not doing well in this math exam, but the main reason is that you don't listen carefully in class, there are too many small moves and you don't concentrate. As a result, many problems are not very clear. In addition, I didn't check carefully during the exam, because I answered many questions incorrectly. Make the math exam unsatisfactory.
However, I will definitely learn this lesson, listen carefully and answer questions carefully in the future. If you have any questions, you can ask your teachers or classmates to get satisfactory results in the next exam. I hope the teacher believes me. I will redouble my efforts.
Analysis of the Final Examination Paper of Senior One Mathematics
There are ten main categories of students' knowledge points examined in this set of papers, which are comprehensive, repetitive and focused. At the same time, they are closely related to the ability test, which requires students to pay attention to basic concepts and knowledge first, lay a good foundation, and then learn to use them flexibly to improve their thinking ability.
As can be seen from the above table, the knowledge points of Grade One are mainly rational numbers in algebra (the largest fraction and the largest proportion), linear equations in one yuan, concepts such as straight lines and angles in geometry and related calculations. The ability is mainly to solve practical problems by enumerating one-dimensional linear equations.
From the algebraic point of view, the concept of rational number should be studied in combination with the number axis. It is difficult to compare size, absolute value, reciprocal, notation, etc. A constant reference. The difficulty lies in the comparison between the results of addition, subtraction, multiplication and division of two numbers on a given number axis and zero. There is a kind of problem that gives the sum of several algebraic expressions with unknown letters to zero in the form of absolute value and square number. Using the characteristics of absolute value and square number, we can find the unknown number and carry out related operations, such as question 5. The solution of linear equations is the focus of this semester's course. This set of papers covers 8 topics. In the process of learning, students should master the basic shift term and turn the unknown coefficient into 1, master the solution of the linear equation with a fraction and learn how to remove the denominator, and be careful not to make mistakes in the process of solving problems. The proportion of solving application problems by using one-dimensional linear equations is very high, which is also a test of candidates' comprehensive ability. For each kind of application problems, students are very clear about the equivalence relationship, such as the trip problem: distance = time * speed; Discount problem: several discounts mean that the price is a few tenths of the original, and profit = total sales price-cost; Work efficiency: if a job lasts n days, then the daily workload is1/n; The relationship between quantities: find a quantity as a standard, see how much the others are more or less than the standard quantity, and make an equation according to the meaning of the question; Cost problem: total price = unit price * quantity. As long as the students understand the topic and analyze it well, the problem can be solved.
In geometry, the knowledge points about angles are examined the most. The basic concepts begin with points and lines, and the concepts of straight lines, rays, line segments and the distance between points are memorized, and the concepts of angle, complementary angle, complementary angle and bisector of an angle are introduced. It's just that rote learning is not enough. Students should also have certain abstract thinking ability, such as 8 questions, 13. In this set of problems, it is difficult to calculate the angle. Line segments and angles are the focus of this semester. There are also 14, 15, and 34 test sites about stereoscopic graphics. Students should do more in the learning process and give full play to their spatial imagination. When learning geometry from grade one, it is necessary to cultivate good study habits. First, we must master and understand basic concepts skillfully, and second, we must cultivate our own abilities, such as observing graphics, divergent thinking, spatial imagination and so on.
From the aspect of sampling, understand the significance of samples in practical problems; Master the operational relationship between average quantity and total quantity; Be able to read circular charts and bar charts, and see the given quantity clearly. This part of the exam is not too difficult. As long as students learn it, it is easy to score in the exam.
Questions 33 and 35 in this set of papers are about finding rules and defining new operations. These questions are very popular in exams now, mainly to examine students' comprehensive ability. Students should pay more attention to training in their usual training.
Before the exam, students should pay attention to quality and understand every knowledge point thoroughly. I believe it will be invincible!