Happy Chinese New Year's Eve.
The Spring Festival Gala performance is magical.
Leave luck behind and worry behind.
These little guys know all about it, right?
This year's Spring Festival Gala.
Liu Qian will lead the whole country.
A wonderful card game was staged together.
Let's "witness this magical moment" together
New Year's wishes. 
Mr. Liu Qian's tricks are too charming.
Something hidden behind magic.
Math puzzles are also fun.
Today's freshmen in the Department of Mathematics.
It will "re-learn" everyone once.
Recreate a fun "miracle".
Make the "miracle" happen.
The first step.
The four cards are numbered as ABCD from top to bottom, and the eight cards can be combined by "folding, stacking, and pulling", and their order is ABCDABCD.
The second step.
Move the cards from the top of the stack with the same number of names to the bottom.
It should be noted that no matter how we change the card, the final outcome is like this:
file abcdabcd
bcdabcda
cdabcdab
dabcdabc
Through our research, we can see that these four cards have the following characteristics:
1.The four cards in the front are arranged in the same way as the four cards in the back;
2.The first four cards and the next four cards all contain A, B, C, D;
3.The fourth card must be the same as the 8th.
The third step.
Put the first three cards in a stack of **, then take out the top cards and set them aside.
It should be noted that the first three cards are placed after **, and when the 4th card is moved to it, it forms a "head and tail correspondence", so that 1 and 3 become a pair, no matter which kind of card ** is, it no longer makes sense. The middle card is an "x", and the key cards in front and back are an "s".
The current order is: xxxxxxs (the top ace s, which is set aside).
Then, he had to dispose of all the x's cards, leaving only one s.
Step 4.
Take out a card from the stack of cards, insert it in the stack of cards**, take one from the south, take two from the north, if you are not sure whether it is south or north, then take three, anyway, no matter how you change, the rest is the same, the order is still xxxxxxs.
Step 5.
Throw a few playing cards from the top, the boy throws one and the girl throws two, at this point the order of the boys is xxxxx and the order of the girls is xxxxx.
Step 6.
After reading this sentence, the players will take out a card from the top and put the card at the bottom, for a total of seven characters, after seven rounds, the order of the cards for men is xxxxxx and the order of cards for women is xxxxx.
This step is the most important one! It's a great position!
Step 7.
From the top pile, move the top piece to the bottom of the pile each time, then throw the top piece out, repeat the top action until the last piece remains, and then see if the rest and the next card form a whole.
Note that when the boy completes this step, the order of the cards will change, which is the order of the girl's last move.
Then do a similar action, and the order of the cards becomes xxsxx, sxxx, xxs, sx, s.
s+s, you're ready to go!
"Miracles" and mathematics.
And in this process, the most important trick is to "abandon the card, abandon the card". The reason why this magic has been able to achieve so much is actually a mathematical puzzle known as the Joseph problem.
Joseph's Puzzle: One group of people sits at a table, starting with number one, and in order, one will knock out one on the left, and the other person who is not selected will kick one player on the left out, and so on and so forth, until only one player is still alive, and you will ask him, what is his number?
Why didn't the "miracle" created by Xiao Ni happen?
After the magic show.
Nigmaiti goofs are pushed to the top of the hot topic!
Why can't Ni put his cards together?
Here's an answer.
Xiao Ni doesn't put the first three cards on a stack of **.
He just put a card at the bottom.
Let's rewind and see how Niny did it.
Therefore, the "miracle" will not happen!
Why do we believe in "miracles"?
For "miracle", the most attractive thing is not its "magic", but that we can witness and participate in a "magical" performance together on such a major occasion as the Spring Festival Gala.
Every step of the magic has to use different words, east, west, north and south, boys and girls, we all have to remember. We did it at every turn, keeping the joy around, the sorrow aside, and turning the two decks into a deck. Witnessing "luck" together and firmly believing that "happiness" is a wonderful experience.
In the hands of the magician, the calculation formula, which was originally somewhat boring, became vivid in the hands of the magician.
Create a "miracle" for all
The seniors of the Department of Mathematics also brought us a small "miracle", let's take a look.
1.Prepare 3 cards, divide them evenly into 2 pieces, and fold them up;
2.Move the cards from the top of the stack with the same number of names to the bottom.
3.Draw 2 stacks from the stack, put them in the stack**, and hide the top piece of the stack separately;
4.Science candidates, draw 1 from the card stack, if the liberal arts candidate, draw 2 from the card stack, if the liberal arts or science subjects are not clear, then draw 3 cards from the card stack, and put the drawn cards on the rest of the cards **;
5.If it is a boy, it will not move, if it is a girl, take two cards from the stack and roll it;
6.silently chanted "pragmatic innovation, academic rigor, pragmatic pragmatism, steel cradle" in his heart, and then turned the cards on the stack of cards to the bottom one by one, and went through each word;
7.When he read "Beijing University of Science and Technology", he moved all the cards on the stack of playing cards to the bottom, and every time he counted "big", he would throw all the cards out until the last one.
8.Combine the remaining cards in your hand with the cards hidden in step 3.
Guys, have you discovered any new "miracles"?
The magic of magic.
Math is also fascinating.
Magic demonstrated with math tricks.
It's a different kind of charm.
Cute little shells.
Have you ever seen the "miracle" of magic?
What "miracles" have you seen?
In fact, it doesn't matter if you don't understand it.
Immerse yourself in magic and feel the wonder it brings.
Study hard and savor the joy of mathematics.
Faith! It's seamless!
Beijing Institute of Technology.
Production: Mediacorp Centre.
Source: Department of Mathematics.
Source**: Internet.
Zhang Zehua. Editors: Sun Yi, Li Shijun, Zhang Biyun (Note 1).
Chen Jinghong, Li Shenglei, Fu Xiaozhen and others.
Review: Xue Lang.
Editor: Yang Meixi.