Commonly used formulas, such as multiplication formula in mathematics, trigonometric function formula, commonly used numbers, such as 1 1~25 square, trigonometric function value of special angle, chemical properties, valence and chemical reaction equations of commonly used elements in chemistry, etc. It should be memorized, and it is time-consuming and laborious, which is very beneficial to improve the calculation speed.
The more familiar you are with the content of learning, the more familiar you are with the basic ideas and methods of solving problems, the more numbers and formulas you recite, the more you can organically combine the part and the whole to form a jumping thinking, and the speed of solving problems will be greatly accelerated.
Learn to draw when solving math problems in junior high school: Learn to draw when solving math problems. I hope the students can learn to draw well. Drawing is a process of translation. When reading a topic, if you can draw an analysis chart of your understanding of mathematics (or other disciplines) according to the meaning of the topic, the topic will become vivid and intuitive. In this way, abstract thinking in solving problems becomes thinking in images, thus reducing the difficulty of solving problems. Some topics, as long as the diagram is analyzed, the relationship will be clear at a glance.
Especially for geometry problems, including analytic geometry problems, if you can't draw pictures, sometimes you can't start at all. Therefore, it is very important to keep in mind the basic drawing methods of various questions, the images and meanings of various functions, and the evolution process and conditions to improve the speed of solving problems. Pay attention to drawing as accurately as possible when drawing. Accurate drawing can sometimes make you see the answer at a glance, and then further calculation can confirm it: on the contrary, inaccurate drawing can sometimes lead you astray.
A survey of junior high school mathematics problem-solving methods: for a specific exercise, the most important link in solving problems is the theme. Carefully examine the questions. The first step of examination is examination, which is a process of obtaining information and thinking. Read the questions slowly, think while reading, pay special attention to the inner meaning of each sentence, and find out the implied conditions.
What are the known conditions once reading is over? What is the conclusion of the solution? What conditions are still missing? Can you deduce them from the known conditions? In your mind, this information should have formed a network, you have a preliminary idea and solution, and then you can calculate and verify according to your own ideas.