1, so that students can experience the process of matching two things, initially discover the laws in simple matching phenomena, and use the discovered laws to solve some simple practical problems.
2. Make students experience the diversity of problem-solving strategies in activities such as observation, operation, abstraction, generalization, cooperation and communication, and develop a preliminary sense of symbols and orderly mathematical thinking.
3. Make students actively cooperate and communicate with others in the process of exploring laws, gain some successful experiences, and cultivate their interest in learning mathematics.
Teaching emphasis: think methodically and operate orderly with symbols.
Teaching preparation: courseware, pictures of hats and puppets, and homework paper.
Teaching process:
First, create a situation, the initial perception of matching
On Sunday, Xiao Ming came to the store and saw (2 hats and 3 puppets) on the counter of the store. (There are pictures on the blackboard) He said: There is a red hat, a black hat, a yellow puppet, a purple puppet and a blue puppet. Xiaoming wants to buy a puppet doll with a hat. How does Xiaoming choose? (blackboard writing: optional)
How many different collocation methods can Xiao Ming have? It seems that this collocation still hides a lot of knowledge. Today, we will learn the knowledge of matching in this class. (Complete blackboard writing: knowledge in matching)
Design intention: Students often encounter practical problems related to collocation in daily life, such as clothing collocation, food collocation, color collocation, route collocation, etc ... Although the phenomenon of matching is very common, students have not studied these things carefully, especially from the perspective of mathematics. Under the guidance of teachers, let students study some common collocation phenomena, learn collocation methods initially, and experience the law and calculation of collocation, which is the carrier of developing mathematical thinking and is also conducive to the cultivation of students' self-care ability.
Second, practical operation, experience orderly thinking
1, pose diagram (2 hats, 3 puppets) Students pose individually to see how many different collocation methods they can find.
Students' activities, teachers' inspection, pay attention to different collocation methods between students.
2. Students report the matching process and say it while demonstrating.
3. Comparative method
Which one do you prefer among the collocation methods of the children just now? State your reasons.
It is a good way for students to experience orderly collocation.
Conclusion: Yes, ordered matching allows us to find out all the matching methods without repetition or omission. (blackboard writing: orderly, without repetition or omission)
Two hats are for three different dolls. How many ways are there to wear it? How to wear it? Give one at a time, one empty; Or two people, one by one; Or neither, arm in arm, one on each side.
How many kinds are there in voodoo doll? Function? Voodoo doll's meaning: Bad devil: Good for evil is an outdated concept, and tit for tat is the normal state of the world. If you want to severely punish the person who gives you trouble, I recommend this degenerate angel to let you vent your grievances. Demon: Deal with the person who gives you trouble, but if you are kind-hearted and compassionate and don't want to hurt the other person too much, then give it to the demon and teach that ignorant guy a lesson. Demon: azazel and the Black Demon have "double-sided" power. The black devil can use black magic against your enemies, and azazel can show him the disaster. Be careful who gives you trouble. (color: red and black) devil: an upgraded version of the red and black devil. The dark Lord can use black magic on your enemy, and the red Lord can show him the disaster of blood loss. Be careful who gives you trouble. With wings, magic is stronger and more handsome. (color: red, black) cherub: What about people who don't feel good about life? Don't be discouraged, angel dolls are responsible for guarding your good luck and letting angels accompany you. I believe you will have a smooth sailing, and good luck will definitely find you. (Colors: pink, orange, blue, bright blue) Voodoo Curse Zombies: voodoo doll Zombies, which are extremely popular, are carefully designed for the unfortunate people who have suffered from villains recently. They specialize in treating villains, sealing their mouths and stopping their hearts with needles, so that the villains around them can no longer move or turn over. (Color: white, black, green, linen) Safe Boy: Have you often fallen recently? Always bitten by dogs? Can't a minor illness be cured? A safe boy with a bandage on his hand and a plaster on his foot looks like a dying god. He absorbed the diseases, disasters and dangers that befell you, and bore the pain you will face on your behalf. Want to keep safe? Want to seek health and find someone to take a bullet? That must be "safe boy"! (Color: pink, yellow, red, blue, black) Muay Thai: Strike bad guys. Recommend it to you at low tide and when facing challenges. Under the super guardian of Muay Thai baby, I am not afraid of anything, and the Vietnam War is getting stronger. (Color: red, blue) Kosha Rose Sebert Female Warrior (Zoe): Daughter should be self-reliant! The female warrior Kesha Rose Sebert of Amazon will accompany you and let you go forward bravely. Kesha Rose Sebert Rose Sakya Baby: Sivir guarding her homeland. The design concept comes from the female warrior in matriarchal society. Witchcraft to protect home. Captain Hook: Inheriting the spirit of pirates taking risks and making trouble in the sea of Wang Yang, Captain Hook can take care of all those who need to cross the ocean and protect all friends who are struggling abroad. Little Pirate: Guard all the people who need to cross the ocean in the sky and on the ground, and go out to study hard and make friends. (color: white, linen, coffee). Pumpkin: Jack, the pumpkin devil on Halloween, specializes in guarding your family and friends. Little prince: a gentle and kind little prince from the fairy tale world. I can take care of you, support you, protect your family, accompany your beloved and spend every lonely and happy day with you. (Colors: pink, orange, red, green, blue, black and purple) Spider Boy: Is there anything you hate, envy or hate? Spider-Man will exert its super cohesive force, lay a tight encirclement, control the whole territory, and trap your enemy so that he can't exert himself. Pumpkin: Protect lovely children and make them grow up happily. Ronin: A wild Japanese ronin who likes to travel around the world. Freedom, natural love to make friends. Hang it on your body, and your friends will treat you as a good brother and treat you sincerely. Batman: For you who often walk at night and are afraid of meeting ghosts, I recommend this night guardian, so that you are no longer afraid of taking a taxi in the middle of the night and getting off work late. Samurai: Deal with the bad guys who want to hurt their masters. Loyal, he will be your bodyguard and kill those who want to hurt you. Little wizard: There are many dreams in life, but few can be realized. A little wizard can make your dreams come true and your career soar. Love is a little Cupid: no matter how hard you try, the final outcome of your relationship will still fail. Have you had enough of fruitless love? Qiu Weiyuan, the angel of love, hopes to help kind men and women find Mr.Right. I wish you an early marriage and find a real peach blossom. (Colors: pink, orange, blue, bright blue) Spirit of love: Why is it always difficult for you to communicate when you all speak Mandarin? Want to express yourself well and stop this boring and painful "guessing game"? I recommend voodoo doll, a "love fairy", to help you communicate smoothly, to help you pass on your love, and to rebuild a bridge of love for the two of you. (Colors: red, green, blue, linen, bright blue) Lover's story (I+U=WE): If you think that you are often forgotten by the elderly, then you will always be single on Valentine's Day. I recommend "I +U = The Story of Our Lovers" voodoo doll. This doll is popular, which is of great help to you who want to attract peach blossoms and become attached. Don't do this again on Valentine's Day. (Color: white, pink, red, green, blue, purple, bright blue) In love: I will stir up the love that has lost its spark for you and enjoy the feeling of fatal attraction forever. Heart thief: born with a bitter gourd face, parents don't love supervisors! Some people say that everything is decided at first sight, but unfortunately, your appearance is your achilles heel. You were beaten on the road for no reason. The teacher who behaves well in class asks you to stare at him by name. You can't stand the failure of repeated interviews? Recommend your lovely Heart Stealer. This doll is very popular and charming. With its company, it can also increase your self-confidence, make your smile more beautiful, strengthen the first impression of the interview, let you steal the heart of the supervisor and win the appreciation of the boss. Do you want him (her) who fell in love at first sight to feel "electric shock" to you? Consider having this voodoo doll. Honey, has he (she) changed his mind? You can also let the heart thief steal your heart back! (color: pink, orange, red, green, blue, black, purple, bright blue) VOODOLL DOLL: Love lasts for a long time, which is caused by witchcraft of "love poisoning". Let you be entangled with the person you love, and the incredible mysterious power will keep your love until you are satisfied. (Color: red, black, hemp, coffee) Momotaro, the Healing Ninja: It's becoming more and more popular now. He doesn't know how to control his emotions. But such people often hurt the closest relatives around them, so buy a ninja doll for your grumpy self or loved one and learn the skills of ninja. He will protect and naturally influence your grumpy personality, and at the same time enhance your perseverance and endurance. ~ strawberry families with insufficient endurance and poor stress resistance can also apply. (color: white and black) Jungle boy: Is the office more terrible than the Amazon forest? Newcomers, come here! The fax machine is broken? I want to know where the copier is. Don't understand what the boss said? You can't accept the company system? Nobody wants to teach you? Nobody wants to talk to you at work? You need a "Yelin Boy" doll for newcomers who are not used to the office and environment. Ye Lin boy's design concept comes from the wild forest, and he grew up in a natural world full of dangers and challenges. Ye Lin boy has cultivated unparalleled courage and determination, will not be defeated by any setbacks, will adhere to a strong will to survive, and will infect you to become stronger and stronger in the workplace. Crying baby: There are always many bumps in life. Sometimes crying is a good way to vent. Have you had enough of this weak self? Crying baby will catch yourself crying in your heart, accompany you, let you summon up courage, get out of pain, be completely strong, forget all the unpleasantness in the past and face tomorrow. (Colors: pink, orange, red, green, blue, purple, hemp, bright blue) Monkey King: For people who eat creatively, lack of inspiration is not an excuse. Inspiration needs to be discovered by yourself. Brother Wukong's 72 changes allow you to create endless creativity every day. Suitable for creative workers such as advertising artists. P JUNG: I've been very irritable recently. Everything is not going well? Flying pigs accompany you, learn the healthy attitude of pigs to eat well and sleep well, so that you will always have a good mood. (Color: white, pink, black) Piglet: a superstar in the slimming world. Protect you on a diet. It's bulimia, the savior of bulimia. Let you lose weight without forgetting happiness and keep a good mood at all times. Super boy: "The earth is very dangerous, and we can't find our way back." This is what Stephen Chow said. There are more and more patients suffering from depression. Superman Secret Service Team is responsible for saving the mood and recommending it to the poor earthlings who are unemployed, lovelorn and drop out of school, so that you can regain your confidence. Mr. Franken: Does work consume too much brain power? Do you always like to get into a dead end? I recommend you as an ugly but gentle Frankenstein. The design feature of this doll is to lock troubles and worries, and at the same time, the brain reminds you to think calmly, so that you can stay awake and get rid of troubles in hot summer. (Color: white, green, black, linen) Sad boy: The concept of "hanging people" comes from the upside-down people in Tarot cards. The meaning of handstand in tarot represents sacrifice and waiting. From another angle, retreat for progress. Therefore, the hanging sacrifice of the hanged person makes you turn from black to red from the bottom of the valley, reminding you to recognize the difficulties you are facing now, find a way out and retreat for progress. (color: pink, orange, red, green, purple, hemp) Judo JUvenile (ju! DO): even if it is unreasonable to face other people's demands, it doesn't mean to say "no"? For those who don't know how to refuse others, I recommend you as a "judo teenager". He can easily refuse the money you don't want to borrow and the reward you don't want. ONI boy: "ONI boy" holds a mace and imitates the red ghost, the representative of the four Japanese ghosts and gods. The four ghosts represent power. Do you want to be stronger? Want to be more courageous? Choose ONI boy. Also known as ONI: One of the Four Ghosts, which means power. Road boy: the pace is always half a beat slow? Not thinking fast enough? Friends always think you are slow? Fast-moving high-speed boys especially speed up your movements and your head. Let your popularity index soar. Little Mommy: She is the wife of a man with a heart. Do you think your boyfriend has too many peaches? Or is the object you like entangled? A woman who knows well is devoted to peach blossoms, and the wild flowers and weeds outside don't want to rob your man. (Color: white, yellow, orange, red, blue, purple, bright blue) Mummy: This is the child of a man and a woman with a heart. She is also the boyfriend of Amazon warrior and Xiaohua. As a descendant of a man and a woman who have a heart, she is second only to the ultimate mummy among mummies, and her magic is super strong, combining the skills of preventing villains and abusing peach blossoms. (Colors: white, pink, yellow, orange, red, green, blue, purple, coffee, bright blue) Mummy: the eldest of mummies, with the strongest curse, is dedicated to dealing with bad teachers, bosses and leaders. Recommend it to those who have deep grievances and are powerless. (color: black, coffee) voodoo doll: Always hiding in the corner crying when abandoned? The evil supervisor is mad and can only be silent? Forever, blessed are those who submit to humiliation! There is a famous voodoo prototype, voodoo doll's "Grass Needle"! This is the first purchase rate of office workers, and it is recommended to those who are on the verge of depression and eager to vent. Warn China, the sad people and evil executors all over the world, you should be careful, don't go too far in everything, and be careful that the scarecrow wants to deal with you! Frankenstein: It can confuse the minds of annoying people. It is the companion of people who stick needles in the grass. Isn't it pleasing to the eye to see the first place in school? Jealous of colleagues' plans is always better than yours? The popular brain lock will solve the problem for you. Let your eyesore lose focus and reason, and see the dark power of voodoo doll. Voodoodoll: He is the little brother of the Scarecrow, second only to his elder brother in strength, and he has a unique witchcraft against villains. Voodoo Warrior (Big Head): Are you afraid of being bewitched by voodoo? Then let voodoo warriors help you. With the powerful fighting power of anti-voodoo fighters, there is no need to be afraid of being enchanted. (Color: white, orange, red, pink, blue, gray, hemp) Dark boy: Want to see someone you hate self-mutilate, autistic and crazy? "Stabbing a person by one person" will make you a thorn in your side, make you lose your mind and end up down and out. Let him see the dark power of voodoo doll, and remember that sincerity is the spirit. He is always preoccupied? He always hesitates? His mobile phone is often broken recently? His cell phone is always quiet on dates? It doesn't matter, the paparazzi king in the paparazzi world specializes in exposing the facts that people want to hide, so let him help you. (Color: pink, orange, red, green, blue, purple, hemp, bright blue) Dracula: Let the people who want to trouble you gradually decline. There are many ways to get rid of annoying things. Vampires will stare at people you hate in the dark, making them sleep badly and gradually decline. Bad boy: People who want to mess with you will have a lotus crisis. Violent teenagers with super hot temper, their favorite toys are iron bars and grenades. Seriously warn the guys who don't know how to live or die around them, pay attention. (Colors: pink, red, green, purple, bright blue) Diapers: Do you want to play a harmless prank on someone you hate? Just call the diaper guy, and he will make a fool of the guy you hate or the person who is not nice to you in public. (Color: black, linen) Child Ghost: A child with the same name as a diaper man secretly wants to fuck your 250. Do you want him to try this kid's tricks? He is your best companion. (Color: pink, green, bright blue) TOUT: Are you a paparazzi? Afraid of being framed Digging into other people's privacy will increase your attention and insight, and let you get rid of the shadow of being cheated and betrayed. (color: black, linen, coffee) sad boy: a destructive king who likes to solve problems with violence. Destroy your opponent's good deeds, make him accomplish nothing, and the cooked duck will fly away. (color: red, purple, phantom killer): Do you want to upset your sworn enemy? Do you want him to always feel that someone is watching him behind his back? Black Ghost will completely destroy him mentally.
There are four hats, red, yellow, blue and green. How many possibilities are there to pull out any hat? Pick out any hat, and the probability of encountering a red, yellow, blue and green hat is one in four, so there are four possibilities.
There are several colors of dolls in anna sui: purple dolls, blue dolls, pink dolls and white dolls.
In addition, personally, I think purple dolls and pink dolls are better. They smell good and are suitable for young girls. . I can't tell the specific taste. Anna Su's perfume is very light, so there is no need to distinguish between the front taste and the back taste. Basically, the smell will be gone in about 3 hours. .
A pair of gloves is cheaper than a hat 12.8 yuan, a hat 2 1.5 yuan. How much does it cost to buy a pair of gloves and a hat? Solution: glove 12.8+2 1.5=34.3 yuan.
All expenses are 34.3+2 1.5=55.8 yuan.
A:
Buy hats at 3 1 yuan, and buy two hats at a time to 59 yuan. How many hats can a teacher buy at most for 208 yuan? 209/59=3…32
32/3 1= 1… 1
3*2+ 1=7 tops
1 handkerchief, 2 dolls, 3 pencil cases and 4 hats. Choose two of these gifts. There are several ways to choose a * * * 1. List the questions in two rows in turn and cross them. Column: 1. Feifei's birthday is coming. Xinxin wants to choose two of the following gifts for Feifei. Please help her choose. How many ways can I give them? There are six kinds of handkerchiefs (1), dolls (2), pencil cases (3) and hats (4).
There are 100 yuan, one * * five pairs, gloves 22 yuan/pair, socks 18 yuan/pair, and one * *. How many kinds of purchase methods are there? 3 pairs of socks and 2 gloves.
4 pairs of socks, 1 gloves.
5 pairs of socks
Where can I buy Japanese puppet dolls online in Guangzhou?
Plus minus one.
Up, down, nine east urgent.