Grade 3 grade application questions about circumference (with answers), please help.

Grade 3’s Perimeter Application Questions (with answers), please help.

A square tablecloth with a side length of 9 decimeters. I want to surround the tablecloth with lace. How long is the lace? 9*4=36 decimeters, please help me with the application of discounts and deductions

1. The selling price of a product is 720 yuan, and the profit is 20% of the cost. If you want to increase the profit to 30% of the cost, how much will the selling price increase? 2. The store purchased 100 color TV sets at a purchase price of 2,000 yuan each. After the purchase, the market conditions were better. They sold them at a retail price of 2,200 yuan each. It took a short time to sell 40 sets. Later, they became unsalable. At the end of the year, At the end of the day, in order to reduce inventory and speed up circulation, the mall decided to offer discounts to the remaining 60 sets. How much discount should be given on the basis of the retail price of 2,200 yuan each, so that the mall can sell all 100 color TVs and make a total profit of not less than 4 %? 3. The original price of air conditioners in a shopping mall is 2,500 yuan each. After discounting, the sales volume can increase by 10 units. If the sales after discount are to be 100,000 yuan, what should the discount rate be?

Please adopt three methods There are 5 word problems in the first grade volume, please help! How to arrange life in third grade? Masters, please help me.

First of all, let’s talk about studying. When studying in high school, take notes, listen carefully, and if you encounter something you don’t know, just ask the teacher and classmates. When it comes to living, it depends on your family’s financial conditions.

If you want to exercise, you can join the school's interest groups, student unions, etc. ~ Because I have just entered college, I got through high school this way. However, everyone's living habits and rhythms are different, so it is mainly up to you to decide! Are there any application questions and answers for junior high school physics? Masters, please help.

[Example 1] A train runs along a straight track. It first travels at a constant speed of 10m/s for 15 minutes, and then changes to a speed of 15m/s. The train travels at a constant speed of s for 10 minutes, and finally advances 1000m and stops within 5 minutes. What is the average speed of the train in the first 25 minutes and the entire 30 minutes? What was its average speed over the last 2000m? [Analysis] According to the law of uniform linear motion, calculate the displacement within the required time or the time required to pass the required displacement, and then the average speed can be calculated from the average speed formula. [Answer] The displacement of the train in the first 15 minutes and the next 10 minutes They are: s1=v1t1=10×15×60m=9×103m s2=v2t2=15×10×60m=9×103m. Therefore, the average speed of the train in the first 25min and the entire 30min is: Because the train passes the last 2000m The first half of the displacement moves at a constant speed v2=15m/s, and the elapsed time is: So the average speed in the last 2000m is: [Explanation] It can be seen from the calculation that the average speed of an object moving at variable speeds in different times (or different displacements) is generally are not equal. [Example 2] The displacement image of an object is as shown in the figure. If east is specified as the positive direction of displacement, try to find: the velocity of the object in each stage of OA, AB, BC, CD, and DE. [Analysis ] The object starts from the origin at t=0 and moves eastward in a straight line at a uniform speed, which lasts for 2 seconds; it remains stationary in the next 3s to 5s; it continues to move eastward in a straight line at a uniform speed in the 6s; it moves westward in the opposite direction at a uniform speed from 7s to 8s, and ends at Return to the starting point at the end of 8s; move westward from the origin in a uniform linear motion within 9s to 12s. [Solution] From the s-t diagram, the speed of each stage is as follows: AB segment: v2=0; [Explanation] It can be seen from the diagram , after t=12s, the object is located 4m west of the origin, that is, the displacement of the object in these 12s is -4m. And the distance of the object in these 12s is (12+12+4)m=28m. It can be seen that when an object does not move in a straight line with uniform speed in one direction, the size of the displacement is different from the distance. [Example 3] Figure 1 shows the displacement images of four moving objects. Try to compare their movements. [Analysis] The displacement graphs of these four objects are all straight lines, and their displacements increase with time, which means that they all move in a straight line at a uniform speed in the same direction (the positive direction of the displacement), but their speeds and starting conditions are different. [Answer] The two objects a and b start from t=0 and move in a straight line at a uniform speed in the positive direction from the origin. Object c starts from s1 in front of the origin and moves in a straight line at a uniform speed in the positive direction at t=0. The object d only starts at time t1. Make uniform linear motion in the positive direction. It can be seen from the figure that for any given time △t, their displacement △s is different: △Sc＞△SB＞△Sa＞△Sd, so the relationship between their speeds is vc>vB >va>vd. [Explanation] The movement of the objects corresponding to these four graph lines can be imagined as four athletes running a 100-meter race. The starting gun sounds, and athletes a and b start from the starting line at different speeds. Athlete c then "Front start" - the departure has started at time t0 before the starting gun sounds, so when the starting gun sounds (t=0), he has already run to the point s1 directly in front. The d athlete reacts slowly and does not start starting until a period of time t1 after the starting gun sounds. ——Equivalent to starting from s0 behind the starting line when the starting gun sounds (t=0) (Figure 2). According to the meaning of the slope of the graph, it can be seen that the slope of the displacement image of uniform linear motion is equal to the speed, that is [Example 4 ] For an object moving at a uniform speed in a straight line, then [ ] A. The displacement in any 2 s must be equal to twice the displacement in 1 s B. The displacement in any period of time must be equal to its distance C. If the speed of the two objects is the same, Then their speeds must be the same, and the distances traveled in the same time are equal D. If the speeds of two objects are the same, their speeds must be the same, and their displacements in the same time are equal [Analysis] When an object moves in a straight line at a constant speed, the speed v The magnitude and direction of are constant. From the formula s=vt, we know that its displacement is proportional to time. And since the direction of the speed v remains unchanged, its trajectory is a one-way straight line, and the displacement in any time is equal to the distance. When When v1=v2, it means that the size and direction of the two objects are the same, and the distances in the same time must be equal. But when the velocity |v1|=|v2|, the moving directions of the two objects may be different, and the displacements in the same time may be different. etc. [Answer] A, B, C. [Example 5] The S-t images of the motion of three objects A, B, and C are as shown in the figure. The correct one of the following statements is [ ] A. Object C accelerates in a straight line Movement B. Object A makes a curved motion [Misunderstanding] Choose (B), (C), (D). [Correct answer] Choose (A). [Error cause analysis and problem-solving guidance] The displacement image of a moving object (referred to as the S-t diagram) represents the change in displacement of an object in linear motion with time. The displacement image is not the movement trajectory of the object. Option (B) mistakes the graph for the movement trajectory of the object, which is completely wrong.

The slope of the line in the displacement image represents the speed of the object, so option (A) is correct. Average speed = displacement/time, the three objects have the same displacement within the time 0-t0, so the average speed should be = distance/time, the distances traveled by objects B and C within the time 0-t0 are equal, and the distance traveled by object A is larger, [ Example 6] Two vehicles A and B pass through the same displacement along a straight road. Vehicle A moves at a speed of v1=40km/h in the first half of the displacement, and vehicle B moves at a speed of v2=60km/h in the second half of the displacement; In the first half of the period, it moves at a speed of v1=40km/h, and in the second half of the period, it moves at a speed of v2=60km/h. Then the relationship between the average speeds of vehicles A and B during the entire displacement is [ ] [Analysis] Assume the total displacement is s, then the moving time of car A is, so the average speed of car A is. Let the total moving time of car B be t, then the total displacement of car B is, so the average speed of car B is [Answer] C. Calculation, it does not Is equal to the average speed of the variable-speed straight-line motion. If the average speed of the object during the first half of the motion is v1, find the latter.

If the average speed of the first half of the movement is v1 and the average speed of the second half of the movement is v2, then during the whole journey [Example 7] the steam valve is closed before the train enters the station. When it decelerates and slides for 300m, the speed of the train has slowed down. Half, then it continued to slide for 20 seconds and then stopped exactly on the platform. Find the total displacement of the train and the displacement in the last 10 seconds. [Analysis] The research object here is the train. The motion diagram based on the meaning of the question is as shown in the figure. Assume The speed at which the train starts to brake and slide when it reaches point A is v, and the speed when it reaches point B is =20s. [Solution] Because vB is exactly equal to the average speed during the entire taxiing process, that is, vB = the movement time of the car in sections AB and BC must be certain Equal, that is, t1=t2=20s. Since the average speed of the train in section AB and section BC is v1:v2=3:1 respectively, if we consider it from the end point C in the opposite direction of the original train movement, the initial speed of the train is zero. Uniformly accelerated motion. According to the relationship s∝t2, the displacement in the last 10s (i.e., the first 10s when observing in the opposite direction) is only 1/4 of the displacement in the last 20s (i.e., the first two 10s when observing in the opposite direction), so [ Explanation] Due to the flexible application of the speed characteristics of the "time midpoint", the proportional relationship of displacement and the thinking method of reverse conversion, this problem can be solved relatively quickly. Please understand it. [Example 8] The length of a queue is L=120m. The traveling speed v1=1.6m/s. In order to convey an order, the correspondent runs from the end of the line to the front of the line at a speed v2=3m/s, and then immediately returns to the end of the line at the same speed as the line's traveling speed. Question : (1) How long does it take for a correspondent to leave the team and return to the end of the queue? (2) How far is the distance between the place where the correspondent returns to the team and the place where he leaves the team? [Analysis] There are two research objects here: the correspondent and the marching team. Both move in a straight line at a constant speed. The motion diagram is shown in the figure. Assume that the original position of the team is AB. When the correspondent rushes from the end of the row to the front of the row, the head of the row moves The position A' has been reached, and the time taken is t. When the correspondent returns to the end of the queue, the position at the head of the queue is A", and the time taken is t'. In time t, the difference between the displacement of the correspondent and the team is equal to L; in time t', The sum of the displacements of the correspondent and the team is equal to L. [Solution] (1) When the correspondent rushes from the end of the platoon to the front of the platoon, there is a relationship: v2t-v1t=L ① Assume that the speed of the correspondent returning from the head of the platoon to the end of the platoon is v2′, and its value is v2′=v1= 1.6m/s, and there is a relationship: v1t'+v'2t'=2v1t'=L ② By combining the two formulas, the correspondent can change from leaving the team (the last one) to returning to the last one** *Time required: (2) The distance between the place where the correspondent returns and the place where he leaves the team is the distance traveled by the entire team in the same time, that is, s'=v1T=1.6×123.2m=197.1m [Explanation] According to the relativity of movement, if As a reference object, the marching team can be simplified to a research object, that is, the correspondent's uniform linear motion relative to the "stationary" team. When leaving the team, the correspondent moves toward the front of the queue at a uniform speed with a speed equal to (v2-v1), catching up. Time to return to the team: November 2813. Answers to the questions. Gods, please help.

The 12 third-party players in Grade 1 picked up the same "Persian Cat" from Taiwan and China. They all picked up the same "Don't Talk" from Hong Kong. They replied to the post before you did. People are stupid and have bad character. The baby has no teeth when he is born. His temper is so stupid that he dies in Yibin, Sichuan. He is despised in just one second. -------------------------- There is no one in the second grade! I'm not Huang Rong in the tea garden dating mode 3.1416 De Gaulle is not as good as sleeping in bed because of the firmness of Santa Claus. The Red Sea never rains in Japan (One second of love for you) There are too many women lollipops and daifuku god match frogs ----- -------------------------- Grade 3 Pear Swamp Love Without Forgiveness (Taiwan, China) Western United States C High HandmadeCOTY (Japan) Same Weight 1937 Shen Yanbing F1 Racing Car He fainted directly Suzhou Little Tiger Charles de Gaulle's Little Charcoal Vertical Fruits (Spring Trip to Qiantang Lake) My Love Drops (Taiwan, China) Invisible Wings (Taiwan, China) 7 Days of Sweetness (Taiwan, China) ---- ------------- Grade 4 Butterfly Wall Lamp Marriage Can't Find Telephone Pole Cyan Specific Operation Central America Yawn Dot matrix printer does not currently support mobile phone opening of 8,7 meetings for one second. .

Japan's hardness, the CPU that fell to death in the Battle of Toyoshima, let's talk about Korean Grandpa Manshu Ah Ha Du Fu 31 ------------------- 5th grade 2 Yanzi Spring and Autumn Dayan IOI 3 Jiajia Forest Earth and Moon 5 Chickens Dutch Dalmatians Left China Taiwan White Vine Food song South Korea Hunan Northeast Day and Night Out HELP Japan 0.18 seconds Natural Man British Beet------------- 6th Grade Millet Nervous System Kashmir Sheep March 23rd (Venus) China Taiwan Red, Green and Blue Leonardo da Vinci’s friend’s wife (way to go) South Korea Pluto is not named in the article, the official should retire due to old age and illness, Shanghai Book of Rites Quli 19 dotted particle orientation instructions Luo Lin, British, female Shanghai Hongkou Cinema Calligraphy (poc of sunshine) European and American artificial satellites may also appear rainbows----------------------------- Early An airplane that exceeds the speed of sound Banana Takemiya Masaki Ri. Japan 478 Rong Guotuan Pu Songling Xia Zhuang Beer Yao Lu Dongzan Yunnan Violin Synthetic Resin The weather is sunny, and all things breed. The Three Thousand Thousand Worlds Mencius Mencius's Central Thoughts Co., Ltd. Weasel Longan Incense Kidney-------------------------- Signature of the second junior official: Neon Qiao Red Water Vapor Condensation Vinegar persuaded Jobs to put the fruit directly on the plate 1914 Zhou Haidian District Wei Qiang Ruide Qinghai-Tibet Plateau South America Yamawu Palace Masaki 36 kinds of all-day program broadcast after the end of Zhejiang Yangtze River Li Yuchun's father-in-law and daughter-in-law red, green, blue Qin Dynasty --------- Third year of junior high school 1953 Rome 2 Bytes represent the official name of the United Kingdom (modern football) Lu You (Fang Weng) The blind man in Taiyuan 5 kilometers from Oceania caused by melanin "The Scholars" Dickens turned into a butterfly: "Mencius" by the Huaer Band "Mencius" Du Fu (Dream of Li Bai) "The Analects" (The Misfortune Caused by Xiao Qiang) ) Put a few drops of vinegar R Copper brakes on both front and rear wheels Banana pommel horse------------- First grade natural pasture perfect lover: 183 Yue Nv Sword June 5th has only one magnitude Horace fool love : Li Junji 5000 Years of the Yellow River King and Queen: Big Mouth Saving the Earth from the Andes is to save the future. Dipping your front feet into sedimentary rocks has the same effect as standing up to drink water. Afraid of leaving a bad name. Acidic shampoo. Internal memory. Mediterranean Bank of China. Shady slope ctrl+c ctrl+v. Ascend France. My answer on April 22nd: Guo Meimei Spore Plant Cao Huachun hihi byebye: Wang Xinling ------------------- High 2 years old to prevent water evaporation 12358 Zhoushan enemy war strategy "HIHI bye bye`》Wang Cyndi's "Yuguang Song" Athena London Dong Zhongshu British place name Suona 120 Liaoning traditional cross talk 10,000 yuan Supreme Court Swift Water Melody singer Sima Yan has only one magnitude Nantong Corona Color Ball Light Ball Drunk Flower Yin Red Aluminum---- ------------------ High 3 Hydrogen peroxide celebrity name Listen to Yuan Weiren playing guitar: China, Taiwan, Australia Music is less than benzopyrene New home: Fahrenheit, S.H.E Fifteen months tomorrow: Avril Lavigne Flying between the stars: Nakajima Ai, the co-pilot of the Ministry of Public Security, Millet wipes the GIS with a cut onion. Guangzhou’s pollution prevention and control. Qufu’s rural areas are the most harmful to aircraft during takeoff and landing. “Descendants of Soldiers.” Front-wheel drive steam locomotive Li Shangyin wishes the light in the grass by the river. The perfect lover at the ball level: 183. From the first grade to the third year of high school. The second volume of the third grade Chinese language new course standard with two guides and two exercises and efficient study plans and answers. Gods, please help.

Sorry, "Wolf" topic, reading answers. Gods, please help. Help

I came home late after a slaughter, and all the meat in my load was gone, leaving only the bones. On the way, two wolves traveled a long distance. Kill fear and throw bones into it. One wolf has its bones to stop, but the other wolf still obeys. Throw it again, the rear wolf stops and the front wolf comes again. The bones are gone, but the two wolves are driving side by side as before. Tu Da was in embarrassment, fearing that he would be attacked by enemies before and after him. There is a wheat field in Guye, and the owner has accumulated salary in it, covering it into a mound with thatch. Tu Nai ran and leaned under him, holding a knife in his shoulder. The wolves did not dare to move forward and stared at each other. After a while, a wolf walked away, and a dog sat in front of it. After a long time, the eyes seem to be at rest and the mind is very idle. Tu violently broke out, chopped the wolf's head with a knife, and killed it with several knives. When he was about to go, he turned to look at the accumulated salary and saw a wolf hole in it, intending to tunnel in to attack the rear. The body is already halfway in, but the buttocks and tail are only exposed. After the slaughter, his buttocks were cut off and he was also killed. Nai realizes that the wolf in front of him pretends to be in a defensive position to lure the enemy. The wolf is also cunning, and both of them are killed in an instant. How can the beast become so deceitful? Stop increasing laughter. 1. What characteristics of the wolf can be seen in "traveling far away"? It is ferocious. 2. How many major elements are explained to us at the beginning of the text? What are the differences? Please answer using original sentences. Four elements - time: late; place: on the way; characters: one butcher and two wolves; event: one butcher returns late and two wolves travel together. 3. What solution did the butcher come up with in desperation? Throw in the bones (having illusions about the wolf). 4. The butcher’s purpose of “throwing bones” is to do this. Accommodating, giving in to the wolf, having illusions in return, hoping to retreat from the wolf.

5. What characteristics of the wolf can be seen in "running side by side as before"? Greed. 6. Please find the sentence that describes the butcher’s psychology. The embarrassment of the butcher is a fear of suffering the consequences. 7. What kind of psychological changes did the butcher undergo at this time? Throw away your illusions and prepare to resist. 8. What action did he take? He ran and leaned under it, holding a knife in his arms. 9. What about the wolf’s behavior? They are looking at each other. 10. What characteristics of the wolf are shown? Insidious and cunning. 11. What characteristics of the butcher can be seen from how the butcher killed the wolf? Tu violently broke out, chopped the wolf's head with a knife, and killed it with several knives. Brave and decisive 12. Is it just the evil wolf that "stops smiling ears"? Is the author mocking only evil wolves? What inspiration did you get from this story? No, the wolf here is actually the incarnation of the evil person, representing the kind of greedy, ferocious, cunning, and stupid evil person. It means that when dealing with such evil wolf-like evil people, we should be as brave and good at fighting as butchers. This is exactly The moral of this article. 13. How does the article portray the image of the butcher? Psychological description Fear - throwing one's bones to avoid wolves. / Great embarrassment - the wolf still obeys despite the bones. / Fear - be attacked by enemies from front to back. / Enlightenment - slash two wolves with a knife. Action description: These verbs describe the butcher's spirit of being brave, resourceful, daring to fight, and good at fighting. 14. What is the function of the discussion at the end of the article? It is the author's view of the story written. It is not only a mockery of the wolf's sad fate, but also a praise of the butcher's brave and resourceful fighting spirit. Although wolves are greedy, ferocious, cunning and insidious, they are also very stupid. In the face of highly intelligent and brave people, they will eventually die. The discussion at the end is the finishing touch and reveals the theme of the article. 15. The wolf is very cunning, but it finally destroys itself. Why? What inspiration does this story give you? Humans have wisdom, courage and strength that wolves do not have. Faced with evil forces that are as insidious and cunning as wolves, we must not have any illusions or compromise. We must dare to fight and be good at fighting, only in this way can we win. 16. Is the protagonist of this article a butcher or a wolf? Why? Wolf, because the wolf's actions dominate the development of the story, and the author's purpose of writing is to satirize the wolf. Please help me with the answers to Xuanwu 10.25 8pm for grades 3-5 school

Grade 3 Fruit China Taiwan Buy Buy Buy China Taiwan King Queen West. Hidden level 4, two people, including two or more people, Chen Duxiu, Dead Sea, common law country, mall card, Zhuhai. . One is indispensable and the horse is hard to catch. South Korea is updated! Shen Yanbing, Dante, and their two families are facing each other. Let’s talk about Korea. Old man, pest. In the 16th century, Taiwan, China. I want to fly to fourth grade and plan the Battle of Toshima. The dot matrix printer in the upper right corner. Green crabs have high archery skills. c n /s1. Mao Zedong only gave 15. I love Taiwan more and more. Rowling, British female, Chinese spider, Korean honey, Taiwanese longan labor force, thin Ma Yuanhaowen, rare fifth grade, Xu Zhimo, Israel Ouyang Xiu 61, 50 people, turtle tears, Chopin Dayan, France (sent) 29 (day) 10000 21%, soda ash, Li Shangyin, Du Mu Zhejiang Haining Ding France (Hugo) Xu Zhimo Einstein 0.18 seconds Satisfied, please adopt the study weekly sixth grade mathematics answers 33-40 Masters, please help

Hello, I saw that your question will be asked a new question Questions will be squeezed out of the question list. If the question is left unanswered and it expires, points will be deducted and reward points will be forfeited! So I would like to give you a few suggestions: 1. You can choose to ask your question in the correct category or go to the professional website forum related to your question. This way, more people will know the answer to your question, and more people will answer it. More. Second, you can get to know more knowledgeable netizens, and keep in touch with netizens who have answered questions for you. When you encounter problems, you can directly ask these friends, and they will be more sincere and enthusiastic to find answers for you. Third, things that should be done by oneself must still be done by oneself, and some things must be solved by one's own ingenuity. Others cannot do it for you! Only if you do it yourself can it truly belong to you. Others can only provide you with guidance and advice, and ultimately you have to rely on yourself.

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