In the new semester, the school started, and the classroom was not changed, but the sign was changed from the first and fourth classes of junior high school to the fourth class of junior high school.

The new book was distributed, and the students in the second year of junior high school added two new courses, physics and chemistry.

In another weekly math exam, Li Tianran still scored 100 points.

After class, Wang Hongliang, a classmate at the back table, borrowed Li Tianran's roll and revised it.

While changing, he complained, "Why do you want to learn mathematics, it's enough to be able to add, subtract, multiply and divide in life!"

Learning a language is a great way to increase your literary knowledge! English allows you to communicate with foreigners! History can make you wise! Geography keeps you from getting lost!

But what can mathematics do but ruin your whole life!

You use functions to buy groceries! If you go to the Yellow Crane Tower, you can also calculate how far the boat in the Yangtze River is from you! When you see a row of phone numbers, think about whether there is a common formula between them! ”

Everyone was laughing and agreeing, and apparently most people thought that way.

Li Tianran, a former scumbag, also thought like this: In addition to exams, what do we do when we study such complex mathematics? Geometry and functions are not used to buy groceries and settle accounts.

In fact, this may be some of the shortcomings of basic education, such as the focus on grades, the overemphasis on skills and rote memorization.

The basic education of mathematics ignores the penetration of mathematical ideas and the application of mathematical methods, and ignores the development of students' thinking in the process of learning mathematics.

Overemphasizing the results and coping with the exam and ignoring the process.

In fact, mathematics is the foundation of all natural sciences, and it is also the basis of major technological innovations, and its importance has been fully proven in the course of human development.

Pythagoras even said that "mathematics governs the universe", which shows the value of mathematics.

In the physics experiment classroom, Li Tianran and his physics class have finished learning mechanics, and this class is specially for experiments.

Everyone put on shoe covers and lined up to enter the laboratory, which was well-lit, with student experiment tables and square benches neatly placed inside, and physics laboratory rules hanging on the wall.

Everyone sat down in pairs, the equipment needed for the experiment was already placed on the table, and the physics teacher also came to the experimental table at the front of the classroom.

"Students, in the current high school entrance examination, the experimental question is a compulsory question, and the score accounts for 20%, I hope you can pay attention to it, do the test seriously, and fill in the experimental report as required.

Because there are more experiments to do, my chemistry teacher and I have changed tomorrow's physics class with the next chemistry class.

Today, we are going to do 9 mechanics experiments in two consecutive physics experiment classes, and the time is relatively tight, so we will write down the experimental data first, and then write the experiment report after doing all the experiments.

If you can't finish the class, the physics class representative will write it down and hand it in by the morning of the day after tomorrow at the latest. The physics teacher said.

Everyone began to do the experiment as required, because the seats were still seated in the normal classroom, so Li Tianran was still in a group with Sun Wei.

The two of them did experiments together and recorded the experimental data.

The two of them completed the tests of the balance mass measurement, the spring dynamometer force measurement, and the Archimedes' principle in order, and began to do the experiment of measuring the density of solids.

Li Tianran first measured the mass of the stone with a balance of 48g = 0.048kg, and Sun Wei wrote down the data on paper.

Then 20ml of water was poured into the graduated cylinder, and the stone was submerged in the water in the graduated cylinder, and the volume of the stone was calculated to be 20cm³ = 0.00002m³

According to the formula: density = mass/volume, the density of the stone is calculated to be 2400kg/m³.

Li Tianran didn't want to waste time on the side, so while watching Sun Wei do the experiment, he filled in the experimental purpose, experimental equipment, experimental principles, experimental procedures, and experimental conclusions according to the real experimental process.

A complete experimental report was completed in this way, and Li Tianran looked at the other groups, and his own group was considered fast.

Together, the two of them conducted experiments to determine the density of liquids, to explore what factors are related to the mass and volume of matter, to explore the conditions for the equilibrium of the two forces, to explore the factors related to the internal pressure of the liquid, and to explore the conditions for the equilibrium of the levers.

The two worked together tacitly, and when one was doing the experiment, the other was writing the experiment report next to him.

Not only did I finish all the experiments, but I also wrote the experiment reports in class, and most of the other students only wrote 2 or 3 experimental reports......