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Who knows about mathematician stories, interesting mathematical stories, and mathematical knowledge? I want to make a handwritten newspaper, as long as it is about mathematics! Please help me find more and shorter, because I want to make a manual copy! thank you very mnsh! I repeat, shorter!
When he met Nezha, Bajie was walking forward. Suddenly, someone behind him called him, "old pig, so comfortable!" Bajie looked back and saw that it was Nezha, the Third Prince of the king of tota. Bajie shook his head and said, "isn't this the goblin with three heads and six arms?" Nezha was furious when Bajie called him a goblin and shouted, "change!" and then he became three
Find an interesting story of a mathematician A shorter one
On the day of Pu Feng's experiment, the French mathematician Pu Feng invited many friends to come home and did an experiment. Pu Feng spread a large white paper on the table. The white paper was filled with parallel lines of equal distance. He took out many small needles of equal length. The length of the small needles is half of the parallel lines. Pu Feng said, "please put these small needles
Can we estimate the time according to what phenomena in daily life?
Look at the deviation of the sun, the length of the shadow of the object illuminated by the sun, and feel the change of temperature
In the following daily life, what does not belong to translational motion is () A. Objects move up and down with the elevator B. The object moves obliquely with the escalator C. Light rail trains run on straight tracks D. The flag fluttered in the wind
A. The object moves up and down with the vertical elevator, which belongs to translational motion;
B. The object moves obliquely with the escalator, which belongs to translational motion;
C. Light rail train running on straight track belongs to translational motion;
D. The flag flutters in the wind, not in translation
Therefore, D
Explanation of scientific phenomena in daily life Explain the following phenomena: 1. In the cold winter, the water in the kitchen freezes, but the salt water and vinegar don't 2. Boiled soup is hotter than boiled water 3. When conducting water electrolysis experiment, a small amount of dilute hydrochloric acid or sodium hydroxide solution shall be added to the water Also: add a few drops of edible oil to a small amount of white vinegar, shake well and let it stand for a moment. What happens? If you add a small amount of detergent, what will happen?
1. The salt water will meet the ice at minus 20-50 degrees. The more salt, the lower the temperature
Vinegar freezes around minus 20 degrees
2. Soup is denser than water, not oil,
3. A small amount of dilute hydrochloric acid or sodium hydroxide solution is added to the water, which can make the conductivity of the water better
4. Add a few drops of edible oil to a small amount of white vinegar, shake well and stand for a moment, and flocs will appear; If you add a small amount of detergent, shake it will appear foam. Without shaking, it will float on the vinegar noodles.
Strange phenomena in daily life There are answers It should be explained from different angles
What's the hurry? You didn't say anything
RELATED INFORMATIONS
- 1. What are the properties of translation and axisymmetry? What about rotation?
- 2. Give some examples of the constant movement of molecules in life The more, the better. A little more detail = = | (just a little more detail.)
- 3. Is the pendulum of a pendulum moving in translation or rotation The sooner the better
- 4. What is the teaching orientation of symmetry, translation and rotation? How to distinguish symmetry, translation and rotation in life?
- 5. The idiom describing water flow, please 3Q
- 6. Log (a ^ k) (m ^ n) = (n / k) log (a) (m) (n ∈ R) how to prove it? Please do not use the bottom changing formula
- 7. Please explain the difference between log and LG and LN, as well as their formulas,
- 8. When light passes through a glass plate, its intensity should be reduced by 1 / 10, and the intensity of light should be reduced to less than 1 / 3 of the original. At least such a glass plate; (answer: 11) How to solve it with log?
- 9. Which objects are moving in life
- 10. Examples of sliding friction, rolling friction and static friction in life
- 11. Three math blanks 1、 The road repair team has repaired 85% of a highway, and there are still ()% not repaired; If there are still 30 kilometers left, the road will be () kilometers long 2、 A pail of pure milk is 20 liters. After drinking 5 liters, fill it with water. This is the concentration of this pail of milk, which is ()% 3、 3 divide by () = 18 = (): 16 = ()% = 75% It's urgent. You can answer any question you can, and you can answer all the last three questions
- 12. (1) Inject water into a rectangular tank with a length of 2 decimeters and a width of 1 decimeter. When the water in the tank appears square for the second time, inject () liters in total (2) Party A and Party B have the same two cups. Cup a has only half a cup of water, and cup B is filled with 50% salt water. First pour half of cup B salt water into cup a, mix well, and then pour half of cup a salt water into cup B. at this time, the salt in cup B accounts for (- ---) of the salt water
- 13. Standard definition question no 1. Xiao Wang runs an online store and specializes in clothes of a certain brand. Due to the impact of recent inflation, the clothing of this brand has been reduced twice on the basis of the original price of 1200 yuan, and the percentage of each reduction is x, so the current price of the commodity is____________ Element (the result is expressed by the formula containing x) 2. If the solutions of equation 6x + 3 = 0 and 5x + k = 20 with respect to X are reciprocal to each other, then the value of K is ______ 3. Define new operations @ for positive rational numbers a and B as follows: a@b = [(ab+b ²)/ (a-b)], then 2@3 =____________ . 4. Calculate 12 ° 17 ' × The result of 4 - 23 ° 24 ′ 36 ″ is ____ 5. If (3 + a) ²+ | B-2 | = 0, then the value of 3a-2b-2012 is ____ 6. If it is known that the complement angle of an angle is 10 ° more than 3 times of its remainder angle, then this angle is equal to ___________
- 14. Optimization of mathematics class hour of Beijing Normal University in Grade 7 1.8 complete square formula
- 15. The connection and difference between translation and rotation is
- 16. What are the properties of rotation
- 17. The third unit of the second day of junior high school summarizes that the differences and similarities of axisymmetry, rotation and translation are the same
- 18. If the image of the square of the function y = x is perpendicular to the tangent of the function image translated by the vector a = (m, 1) at x = 1, then M= nothing
- 19. On the buoyancy of ships and stones entering the sea from the river I know that because the density of river water is different from that of sea water, the water level of ship entering the sea rises But also into the sea, the stone has always been at the bottom. Has its density changed?
- 20. How do we know the temperature outside the high air plane?