1, probability has problems
"Teacher, I found that the probability formula has problems!" "Oh? Talk about your reason." "There are 50 students in our class, according to the calculation, the probability I have been questioned is 2%, but today this section is almost I answered all the questions. "
2, probability
I went to visit the weather station and saw the latest instruments that predicted the weather. After visiting, I ask the webmaster: "You said that there is a few% of the probability of rain, how is it calculated?" The webmaster did not have to pay more attention: "That is, we have four people here." Three of them think it will rain. "
3, the number of dead people
The British poet Jieony wrote a poem. The few lines were written in this way: "Every minute has a person in death, there is a person in the birth every minute ..." There is a mathematician to read the letter, letter Said: "Dear, read, it is a fast, but there is a few lines of logic, it is difficult. According to your algorithm, the number of deaths in each minute is, the number of people on the earth is constant. But you Also known, in fact, the population on the earth is constantly growing. Examples, there are 1.6749 people in the past every minute, which is more in the born, which is available in the poem. In order to meet the actual, if you don't object I suggest you use the 7/6 score to change the verse: "There is a person died every minute, one in one in one in one in the born every minute ..."
4, experience equation
Physical professor has gone through the campus and encountered mathematics professors. Professor Physics In conducting an experiment, he summed up an empirical equation, which seems to agree with the experimental data, and he invited the math professor to see this equation. After a week, they met, and the mathematics professor said that this equation was not established. At that time, physical professor had proposed further experimental results with his equation, and the effect was good, so he invited the professor of mathematics to review this equation. It is another week, they will meet again. Professor Mathematics told the physics professor to say that this equation is indeed, "but only for the simple situation of the positive real number."
5, staple
Engineers, physicists and mathematicians receive a task: nailing a nail into a wall. Engineers have made a nailser, which can put any possible nails into any possible wall. The physicist has made a series of tests for the intensity of hate, nails and walls, which develops a revolutionary technology - ultra-low temperature supersonic nail technology. Mathematics promotes problems to N-dimensional space, considering a 1-dimensional zone to kninking nails penetrates an N-1 dimensional overall problem. Many basic theorems have been proven .... Of course, this topic is far from the existence of a simple solution.
6, maximum area
A farmer invited engineers, physicists and mathematicians, and wanted to encircle the largest area with the least fence. The engineer went out of a circle with a fence, claiming that this is the optimal design. The physicist pulls the fence into a long straight line, assumes that the fence has an infinite, thinks that the half of the earth is bigger enough. Mathematics laughed with them. He shreddened himself with a very little fence, then said: "I am outside now."
7, mathematician answer
Physicists and engineers take the hot air balloon, lost in the Grand Canyon. They called loudly: "Hello -! Where are we?" After about 15 minutes, they heard the response in the valley: "Hey -! You are in the hot balloon!" The physics guide: "The guy It must be a mathematician. "The engineer did not understand:" Why? "Physics hom:" Because he used a long time, give a completely correct answer, but the answer is not used. "
8, solution is existed
Engineers, chemists and mathematics live in three neighboring rooms of an old inn. That night, the engineer's coffee machine has fired, he smells the smoke, unplug the coffee machine's electric plug, throw it out of the window, and then sleep. After a while, the chemist also smell the smoke waking up. He found that the cigarette butt burned garbage bucket. He belongs to the voice: "How to fire extinguish? The fuel temperature should be reduced below the combustion point, isolate the combustion and oxygen. Watering can do this at the same time." So he dragged the trash can into the bathroom and opened the faucet. When you destroy fire, go back and sleep. The mathematician saw all the windows, so when he found his soot burning a bed, he would not worry. Say: "Hey, solving is existing!" I went to sleep. 9, negative number
Mathematics, biologists and physicists sit in a street coffee house, looking at a house across the street walking out. They first saw two people in, and the time passed, they saw three people. Physicist: "The measurement is not accurate enough." Biologist: "They have breeds." Mathematician: "If you go in it, you will be empty."
10, rescue
One day, mathematician feels that he has been mathematics, so he ran to the fire brigade to announce that he wants to be a firefighter. The fire captain said: "You look good, but I have to give you a test." The fire brigade has a mathematician to the strengthening of the fire brigade. There is a shot in the alley, a fire hydrant and a hose. The fire captain asked: "What do you do?" Mathematician replied: "I took the fire hydrant to the hose, opened the water dragon, and waten the fire." The fire captain said: "The last question: Suppose you walk into the alley, and the stack doesn't have a fire, what do you do? "Mathematician thought for a long time, finally replied:" I will put the goods in the stack. "The fire team called:" What? It is terrible ! Why do you want to put the goods stack? "Mathematician answered:" I have made the problem into the problem I have already solved. "
11, statistician
The composition of mathematics is: 50% formula, 50% proved, 50% imagination. Topologicalists cannot distinguish coffee cups and bread circles. The statistical man's head will say when the grill foot is in the cold ice, "the average feeling is good."
12, the height of the flagpole
A team of engineers at a height of a flagpole, they only have a tape, not fixed on the flagpole, because the tip is always falling. A mathematician passing, unplugging the flagpole, it is easy to quantify the data. After he left, an engineer said to another: "Mathematician is always like this, we want a height, he gives us the length!"
13, differential
The normal function and the index function EX walks on the street. I saw the differential operator. The frequent function was scared and hurried to hide, said: "It is different from it, I don't have anything!" The index function is not panic: "Can it treat me, I am an EX!" The index function meets the differential operator. Index functions self-introduction: "Hello, I am ex." Division Operators: "Hello, I am D / DY!"
14, prove
Prove that all odd numbers greater than 2 are prime numbers, different professional people give different proven: Mathematics: 3 is the magpet, 5 is the magpet, 7 is the magpet, by mathematics, all the odd numbers of all greater than 2 are prime numbers. Physicist: 3 is a magpetity, 5 is a magpetity, 7 is a magpette, 9 is experimental error, 11 is a magpettener, ... engineer: 3 is a magpet, 5 is a magpet, 7 is a magpet, 9 is a magpet, 11 is a magpet, ... ... Computer Programmer: 3 is a magpettener, 5 is a magpetity, 7 is a magpet, 7 is a magpet, 7 is a magpetic, ... Stattician: Let us try a few randomly extracted numbers, 23 is a magpet, 23 is a magpetic, 11 is a magpet, ... 15, π?
Mathematician: π is the ratio of circular length and diameter. Engineers: π is approximately 22/7. Computer programmer: π is 3.141592653589. Nutritionists: You are a kind of mathematics, "send" is a kind of sweet and healthy dessert!
16, black sheep
Physicist, astronomers and mathematicians walk in the Scottish plateau, happening to see a black sheep. "Ah!" Astronomer said, "The original Scottish sheep is black." "Get it, only once observation You can't say this. "Physicist said," You can only say that black sheep is discovered in Scotland. "" Nor, "Mathematics," by this observation, you can only say: here For a moment, this sheep, looking at the perspective of our observation, there is a black on the surface. "
17, not guided everywhere
There is a foreign scholar (engaged in mathematics research) to our school visit, live in the school foreign guest hospital, when he is going, I asked him about the impression of our school, he said: "The hospitality of your school is too bad. I don't dare to live again later! "I hurriedly asked the reason. The professor said: "The bowl of eating, the bowl is not guided everywhere, this is to use it!" I listened, laughed, this professor is a true image! Although it is a joke, it can deepen the understanding of continuous, demonstration concept :)
18. When copying exam, there is a copy of the copy. It was originally | X |, the first person was copied as 1 × 1, the second person waited for a step, and finally 1! Another answer is B / Q, the first copy is 6 / Q, below is 6/9, the last one is simplified, it is 2/3! Bachelor School Judgment matrix type. A family writes too much, the copied people wrote the "non-matrix" into "not necessarily matrix". When the job was sent back, the teacher actually used the red pen to give "one" to the circle. The university is high, and the buddies from Qinghai are studying. I sit in my back. After I finished the test, I told me that I did a mistake. I didn't have a decision. He has changed it, carefully Asked, he gave the partial minority symbol.
19, intersection and parallel
After the teacher finished the collection, the concept of parallel, asked the students: (1) set a = {x│X is a classmate who participated in the 100-meter race}, b = {x│X is a classmate who participates in jump competition}, seek A B. (2) Set a = {x│X is the car of the Red Star farm}, b = {x│X is the tractor of the red star farm}, seeking A∪B. A student represented: (1) A = = {x│X is a classmate who participates in the 100-meter obstacle. (2) A∪B = {x│X is the combined harvester of the Red Star Farm}. 20, love circle
A young man sitting on the beach. The male youth said in the ground. "" I love you, just like this circle, never end. "
The young woman also took a round with his finger on the ground, and then said: "I have no starting point for your love, never start."
21. During the "Cultural Revolution" period, the classmates of mathematics gave the "wandering sent" to pay a couplet: the radius of the curvature is located at the same time is zero-plane batch: round and slide me in the teacher, New Year's Day is on the door. The couplets are: Differential integral variations of fragrances. Fragrances. Revisions. Functional combined, ice ablation, horizontal batch: space transformations on a book on functions, talk about the couplet. My father-in-law has a birthday, and the aunt seeks an old-fashioned to write a pair of father-in-law. When you want to write, you have to write what kind of couplet, answer, write the high talle of the old Taishan, write my low, low Old learning, thinking, one, one: Taizun, Zunren is on, up to 3,000 Li Lingxia, Yuhuang Gang Building, you are in the house; fool is late, late, bottom to ten Eight floors hell, the king of the king, I dredged in the bottom of the well.
