We start with the following equality: -24 = -24 We write the number -24 in two different ways: 16 - 40 = 36 - 60 The numbers 16, 40, 36 and 60 can be written as follows: 4x4 - 2x4x5 = 6x6 - 2x6x5 We can add 25 on both sides of the equation without changing it: 4x4 - 2x4x5 + 5x5 = 6x6 - 2x6x5 + 5x5 Now we see that on both the left and the right side we have a squared binomial (the first squared term minus twice the product of the two terms plus the square of the second) (4 - 5) 2 = (6 - 5) 2 Eliminating the square on both sides of the equation gives: 4 - 5 = 6 - 5 Finally, by adding 5 on both sides, we get the result: 4 = 6 Obviously this demonstration has an error because we all know that 4 is not equal to 6 (or does anyone have any questions?

The mile is an English unit of measure and is therefore most commonly used in English-speaking countries. One land mile is 1,609,344 meters or 1,609344 kilometers. One mile equals 5,280 feet. Its symbol is mi. (from English, mile). Its origin dates from Ancient Rome, where each mile was equivalent to 1000 steps (from the Latin mille passus) taken by the Centurion, and ranged from approximately 1400 to 1580 meters.
The difference between PHI and Pi is much more than just 'H'. The PHI number, represented by the number 1.618 is very important in the art. PHI is generally considered the most beautiful number in the world. This number comes from the Fibonacci series - a famous progression not only because the sum of the adjacent terms was equivalent to the next term, but because the quotient of the adjacent terms had the terrifying property of gradually approaching the number 1.618, the PHI!
We know that the right angle measures 90º and the shallow angle measures 180º. But why are the values ​​90 and 180? In the year 4000 BC, the Egyptians and Arabs tried to work out a calendar. At that time, it was believed that the sun took 360 days to complete orbit around the Earth.
You probably already used your feet to measure some distance, right? For know that the human foot was undoubtedly the origin of this English unit of measurement, which is 30.48 centimeters or 0.3048 meters (or 12 inches). Three feet equals one yard. At least since ancient Greece, the foot was used as a distance measurement and is now used in countries such as the United States, England and, less frequently, Canada.
Pythagoras discovered that there is another way to calculate powers: by summing odd numbers. He found that n 2 is equal to the sum of n first odd natural numbers. Example: 5 2 = 1 + 3 + 5 + 7 + 9 = 25 What is a capicua number? Index Next >> The Magic Number
Slightly increasing your chances of winning in the Mega Sena is possible, even though it is a game of luck. Note that if you make a simple 6-bet, which costs \$ 3.50, you have the following odds of winning: Sena - 1 at 50,063,860 Quina - 1 at 154,518 Quad - 1 at 2,332 Of course, we know that The only 100% guaranteed way to win the top prize at Mega Sena is by making all possible bets.
The custom of naming Bhaskara for the formula for solving the equation of the second degree is apparently Brazilian (one does not find the name Bhaskara for this formula in international literature). However, problems involving equations of the second degree appeared almost four thousand years ago in texts written by the Babylonians.
The Brazilian Society of Mathematical Education (SBEM) elected May 6th "National Day of Mathematics", in memory of the birth date of Julio César de Mello e Souza, the MALBA TAHAN. On this day, it is suggested to promote, in all Brazilian states, the holding of commemorative events, with the objective of disseminating mathematics as an area of ​​knowledge, its history, possible relations with other areas, and to put into discussion some beliefs. about the current teaching of mathematics.
Did you know you can use your fingers to multiply between numbers 6 to 10? To do this, you need to identify your fingers as follows: For example, to calculate 8x9, you tap the finger equivalent of 8 on the finger equivalent of 9 on the other hand, as shown in the figure below. The result will be a two-digit number, where the tens digit will be equal to the sum of the fingers below (including those in contact), and the units digit will be equal to the multiplication of the fingers above.
Notice the early mental development of some of the great mathematicians. Blaise Pascal, at age 16, wrote a treatise on conics, considered one of the foundations of modern geometry. Pascal contributed decisively to the creation of two new branches of mathematics: Projective Geometry and Probability Theory.
Increasing your chances of winning in Lotofácil is possible even though it's a game of luck. Note that if you make a simple 15 number bet, which costs \$ 2.00, you have the following odds of winning: 15 hits - 1 out of 3,268,760 14 hits - 1 out of 21,791 13 hits - 1 out of 691 Of course, We know that the only 100% guaranteed way to win the top prize at Lotofácil is by making all possible bets.
Russian peasants, according to some mathematicians, used a curious process of multiplication. Let's look at an example, where we get the product of number 36 by number 13. We write the two factors (36 and 13) next to each other: 36 --------- 13 We determine half of the first and double the second, writing the results below the corresponding factors: 36 -------- 13 18 -------- 26 We do the same with the results obtained: 36 ------ --13 18 -------- 26 9 --------- 52 Again, we repeat the operation.
Of course, the well-known Pascal programming language was not created by the great mathematician Blaise Pascal, since it was conceived in 1971, more than 300 years after Pascal's death. However, it was named after him in this way. The idealizer of language was Niklaus Wirth, a professor at the Zurich Polytechnic College in Switzerland.
On June 30, 2012, the clocks were delayed 1 second, that is, June was 1 second longer. Scientists explain this interference in Earth's time by the need for adaptation by adding 1 second “leap” to the rate of rotation of our planet. According to the British edition, this was the 25th time interference on Earth.
Do you find it easy to fold a sheet of paper? How about trying to fold it 50 times? Here is the sheet… Folding 1 time… Folding 2 times… Folding 3 times… Folding 4 times… Folding 5 times… Folding 6 times …… You may even be able to fold 7 or 8 times, but nothing more. Amazingly, though, if you could fold the sheet 50 times, it would be about the same thickness as the distance from Earth to the moon.
Many coincidences show the relationship of the number 13 with Pope John Paul II. - Became Pope at 58 years of age (5 + 8 = 13) - His pontificate lasted 9301 days (9 + 3 + 1 = 13) - He suffered an attack on May 13. - Passed away on the 13th week of the year. - When he died he was 85 years old (8 + 5 = 13) - Date of his death: 04/02/2005 (2 + 4 + 2 + 5 = 13) - Time of his death: 21h37min (2 + 1 + 3 + 7 = 13) - He was the 265th Pope (2 + 6 + 5 = 13) Hotel de Hilbert Index Next >> Why Are Antennas Parabolic?
Serginho Crossing the Bridge Difficulty Level: Serginho Malandro had to cross a bridge every day to date Roberleia. One day there was a policeman halfway across the bridge, not letting anyone cross. Whenever the cop saw someone trying to cross, he would send the person back.
Digging a hole Difficulty Level: Two men dig a hole in 4 days. How many days would it take to dig a half hole? * Submitted by Taize Damasceno. Challenge 115 Half Thirteen Challenge Index Next >> Challenge 117 The Fly and the Cyclist
The guava bug Difficulty level: Which is better: find 1 guava bug or 1/2 guava bug? Challenge 111 Birthdays and Probability Challenge Index Next >> Challenge 113 Orlaneide and the Animals
The Night Guard's Resignation Difficulty Level: A great businessman, needing to go to Sao Paulo, came to his night guard and ordered him to wake him at 6 am sharp. At exactly 6 am, the guard woke up the businessman and said: "Boss, I have a bad feeling.