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It can only have power, bracket, fraction, decimal, positive and negative numbers~ No letters! Only 25 questions are enough! There are addition, subtraction, multiplication and division~
All with "" are powers. - 3 "2" + (- 1 / 5) * (- 15) / (- 3) = - 3 * 3 + (- 1 / 5) * (- 15) * (- 1 / 3) - 9 + [- (1 / 5 * 15 * 1 / 3)] = - 10 (- 1 / 8-1 / 36 + 3 / 4-1 / 18) * (- 72) = - 1 / 8 * (- 72) + (- 1 / 36) * (- 72) + - 3 / 4 * (- 72) + (- 1 / 18) * - 72)
1 fill in the blank, 1 Calculation and 1 application problem ~) The 2nd power of 1.2004 - 2003 * 2005=_______ 2. The 2nd power of 2008 / 2008 - 2007 * 2009 3. Xiaoming is a resourceful classmate. After learning multiplication formula, the teacher put forward the following question: Calculation: 3 (4 + 1) * (the 2nd power of 4 + 1), can you use the multiplication formula you have learned to calculate? Xiaoming thought, after writing 3 as 4-1, 3 (4 + 1) * (4's 2nd power + 1) = (4-1) * (4 + 1) * (4's 2nd power + 1) = (4's 2nd power-1) * (4's 2nd power + 1) = 16's 2nd power-1, Then the teacher gave another question. Calculation: (2 + 1) * (2's 2nd power + 1) * (2's 4th power + 1) * (2's 8th power + 1) (2 of the 2008 power + 1), Xiaoming quickly made it, dear readers, try it!
1. = 2004 ^ 2 - (2004-1) (2004 + 1) = (2004 ^ 2 - 2004 ^ 2 - 1) = 12. = 2008 / [2008 ^ 2 - (2008-1) (2008 + 1)] = 2008 / 1 = 20083 (2^2008+1) ＝(2^2-1...
Calculation questions in mathematics volume 1 of junior high school {with answers}
1. - 36 * (1-9 / 4 + 7 / 12)
=-9+20-21
=-10
2. (- 1 / 42) / (1 / 6-3 + 2-7)
=(-1/42×42)÷42*(1/6-3/14+2/3-2/7)
=-1÷(7-9+28-12)
=-1÷14
=-1/14
3. 999 and 8 / 9 ^ (- 2 + 8 / 9)
=(1000-1/9)÷(-18/9+8/9)
=(1000-1/9)×(-9/10)
=-900+1/10
=-899 and 9 / 10
4. (- 49) / (2 and 1 / 3) * 3 / 7 * (- 1 / 3)
=（-49）÷（7/3）×（3/7）×（-1/3）
=（-49）×(3/7)×(3/7)×(-1/3)
=3
1000 calculation problems in mathematics volume 1 of junior high school
[-18]+29+[-52]+60= 19 [-3]+[-2]+[-1]+0+1+2= -3 [-301]+125+301+[-75]= 50 [-1]+[-1/2]+3/4+[-1/4]= -1 [-7/2]+5/6+[-0.5]+4/5+19/6= 1.25 [-26.54]+[-6.14]+18.54+6.14= -8 1.125+[-17/5]+[-1/8]+[-0.6]= -3 [-98...
On the interesting calculation of rational number in junior high school Help me find interesting calculation problems about rational number in junior high school Note: be fun
Take 2, minus 2, 4, 4, 4, 6, 6, 6, 8, 8, and 0, so that the horizontal, vertical and oblique add up to 0
Figure:
The vertical and the oblique can't do it
A mathematical engineering problem in junior high school It takes 14 days for Party A, 18 days for Party B and 12 days for Party C to complete the maintenance of tap water in a residential area. Party A and Party B cooperate in the first seven days, but Party B leaves for a period of time, and Party B cooperates with Party B in the second two days?
Let's leave for X days
(7＋X)/14+7/18+2/14+2/12=1
X = 3
So I left for three days
A group of mowers cut two pieces of grass. The big one is twice as big as the small one. In the morning, all the people mow on the big one. In the afternoon, half of them stay on the big one. In the evening, the other half mows the small grass. In the evening, one mower has just finished cutting the grass on the small one. How many mowers are there in this group, Work from morning to evening, half in the morning and half in the afternoon)
If the number of people is x, each person mows 1 unit per day, the small grassland area is y, then the large grassland area is 2Y,
Mow grass in the morning, X * 1 / 2 = x / 2;
In the afternoon, Mowing Grassland (x / 2) * (1 / 2) = x / 4;
In the afternoon, mowing small grassland (x / 2) * (1 / 2) = x / 4;
The second day was 1 day;
Then: X / 2 + X / 4 = 2Y
X/4+1=y
The solution is x = 8
The total number of mowers is 8
How to solve the problem of equation application in the first volume of mathematics in junior high school Nonsense, of course, it is best to use equation to solve the best example problem and to solve and explain that the serious answer is not clear about the equivalency relationship between the sub travel problem and the engineering problem
A mathematician said that drawing a line diagram is a bridge to solve the problem. During the eleventh period, the engineering team prepared to spend three days to build the road. On the first day, it built three-quarters of the road, the second day completed the remaining one-third, and there were four questions left?
4/（1-3/1）=6m 6/ (1-4/3) =24m
Mathematics application problems in junior high school should be solved by one variable linear equation 1. A city charges according to the following standards: if the water consumption does not exceed 20 tons, it will be charged at 1.2 yuan per ton; if it exceeds 20 tons, the excess part will be charged at 1.5 yuan. The average water charge of a family in May is 1.25 yuan per ton, so how many tons of water does the family use in May? 2. The National Football League A has played eight rounds, and the number of matches played by Shanghai Shenhua team is twice as many as the number of negative games, and the score is 17 points. The league points rule is three points for winning a game, 0 points for a negative game, and 1 point for a flat game. How many games did Shanghai Shenhua team win in the first eight rounds? 3. In one test, a total of three subjects including Chinese, mathematics and English were tested. Liu Ming scored 111 points on average, including 100 points for Chinese and 5 points less for English than mathematics. In this test, how many points did Liu Ming get in mathematics?
Suppose x-20 * 1.5 in May, because x-20 is the excess water charge (1.2 * 20) is not exceeding the water charge, then the excess water charge + not exceeding = x * 1.25: (x-20) * 1.5 + 1.2 * 20 = 1.25xx = 24, can you solve it yourself? 2. Set victory x field (17-3x) + X + {18 - (17-3x) - x} = 18x = 5
My grandfather told Ogawa that you were only 2 years old when your father was as old as you are now. When you are as old as your father, your father will be 74 years old. What are the ages of Ogawa's father and Ogawa now
Let's assume that Xiaochuan's age is X,
Xiaochuan's age is X-2,
So: x + (X-2) + (X-2) = 74,
The solution is x = 26
A: Ogawa's father is now 50 years old and Ogawa is 26 years old now
RELATED INFORMATIONS
- 1. Use the solution of one variable linear equation According to the plan, one third of a highway can be completed in 18 days. If the work efficiency is improved by one fifth after four days of work, how many days can we finish half of it?
- 2. On June 1, I went to Xinhua Bookstore to buy a book. Walking into the bookstore, it was like walking into the sea of books. I crowded into the crowd and bought a copy of "youth composition guide". I was very happy. At this time, a young pioneer ran over and saw that he was very anxious. He also wanted to buy the book, but the odd number had been sold out. I gave my book to him, and the sales assistant and aunt saw this scene, Laugh. (enlarge it into a composition of more than 400 words) On June 1, I went to Xinhua Bookstore to buy a book. Walking into the bookstore, it was like walking into a sea of books. I crowded into the crowd and bought a copy of "youth composition guide". I was very happy. At this time, a young pioneer ran over and saw that he was very anxious. He wanted to buy the book, but the book was sold out. I gave my book to him, and the shop assistant and aunt saw this scene, Laugh. (according to the above story content, please expand reasonable imagination, and write things in detail. If you can't write more than 400 words, you can also make an outline)!
- 3. Xiaoming and Xiaogang go to the library to borrow books. Xiaoming goes once every nine days and Xiaogang goes once every six days. If they meet in the library on February 2, what day will they meet again in the library?
- 4. According to the book classification of Xinhua Bookstore, understand the classification of society
- 5. 1.（10-11）×（11-12）×（12-13）×… ×（99-100）=_____ . 2. - 1 - (- 5 and 1 / 2) × (+ 3 / 11) [main process] 3.2 / 3 × (- 1 / 2) - (- 1 and 1 / 2) × (- 1 and 1 / 3) [main process] 4. Simple calculation: 15 × (- 3 / 5 + 1 / 3) - 24 × (5 / 12-7 / 8) [main process] 5. Using a simple method to calculate: - 8 × (- 13 and 7 / 12) - (- 5) × (- 13 and 7 / 12) + 4 × (- 13 and 7 / 12) [main process] 6. Two kinds of operations are defined as follows: + 0means "+ there is a circle outside" × "means" × there is a circle outside ". For any two rational numbers a, B has: a + ○ B = a + B-2, a ×0b = a · B-2. Find the value of - 4 × (6 + ○ 8)
- 6. On the number axis, an ant starts from the origin and crawls 1 unit length to the right for the first time, then 2 units to the left for the second time, 3 units to the right for the third time, and 4 units to the left for the fourth time, Question: (1) where is the last position of the ant on the number axis? (2) what is the sum of the numbers corresponding to the positions reached after each crawl? (3) how long has the ant crawled
- 7. The Beijing Tianjin Intercity Railway will be put into operation on August 1, 2008. It is estimated that the one-way direct operation time of high-speed train between Beijing and Tianjin will be half an hour. In a test run, the running time of the test train from Beijing to Tianjin is 6 minutes longer than the expected time, and the travel time from Tianjin to Beijing is the same as the expected time The average driving speed is 40 kilometers per hour. What is the average speed from Beijing to Tianjin during the test run?
- 8. The answer to the latest test paper of compulsory education curriculum standard experimental textbook published by people's Education Press I am a teacher, I want to let students read early at the end of the term!
- 9. If the rational number a is greater than the rational number B, then () A. The absolute value of a is greater than that of B B. The absolute value of a is less than that of B C. The opposite number of a is greater than that of B D. The opposite number of a is less than that of B
- 10. 2005x－2007y＝2003 2004x－2006y＝2002 x. How much y
- 11. Stores a and B sell the same goods at the same price, and they offer different preferential schemes. The goods purchased at point a are charged at 90% of the original price. After purchasing 100 yuan of goods in store B, the goods purchased again are charged at 80% of the original price. How can customers choose the shop to get more preferential treatment?
- 12. Mother bought 2 kg of apple and 2 kg of pear, and paid 52 yuan in total. The unit price of pear is 14 yuan / kg. How much is the apple per kilogram? Mr. Li bought two sets of books and paid a total of 22 yuan. The number of copies of the two sets of books was the same, and the unit prices were 2.5 yuan / copy and 3 yuan / copy, respectively. How many copies of each series were there? All of them were solved by solving the equation
- 13. If mother goes to the fruit store to buy apples, if it costs 4.5 yuan per kilogram, she can buy 4 kilograms. If her mother costs 5 yuan per kilogram of apples, how many kilograms can she buy? Answer in two ways
- 14. Xiao Ming paid 20.1 yuan for 3 kg pear and 3 kg apple, while Xiao Fang paid 15.1 yuan for 1 kg pear and 3 kg apple?
- 15. Xiaohua bought 17 stamps with a face value of 20 cents and 10 cents with 2 yuan and 50 cents. How many stamps do you buy? Formula, don't use equations
- 16. Small military 6 yuan to buy 50 cents and 20 cents of stamps, ask these two kinds of stamps, 50 cents have______ Zhang, there are two corners______ Zhang
- 17. How many kinds of postage can be paid with 1 jiao, 2 jiao and 4 jiao stamps each
- 18. There is a section of uphill road and a section of level road from point a to point B. if the uphill road is kept at 3km per hour, the level road is 4km per hour, and the downhill road is 5km per hour, then it takes 54 minutes to get from point a to place B, and 42 minutes to place a to place A. how much is the whole journey from point a to point B?
- 19. Team a, team B and team C built a highway. Team a built three eighths of the total length. Team B built 40 meters more than team C. how long is the road? Xiaoxing, Xiaohong and Xiaohua have 207 shells in total. Xiaoxing takes 5, Xiaohong takes 4, Xiaohong takes 5, and Xiaohua takes 6. When all the shells are taken, how many shells will each of the three take?
- 20. Seventh grade textbook of binary linear equations solution - elimination, help to solve a few mathematical problems, urgent! Using our seventh grade solution ah, to process 1. Rewrite the following equation into the form of Y expressed by an expression containing X: (1) (2) one quarter x + seven quarters y = 2; （3）5x-3y=x=2y; (4) 2(3y-3)=6x+4