![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
. complete the formula 1.25x3.43-1.25-1.43x1.25 1.6x16+0.4x36 The front of 1.6 is blank
1.25x3.43-1.25-1.43x1.25
=1.25x(3.43-1-1.43)
=1.25x1
=1.25
1.6x16+0.4x36
=1.6x16+1.6x9
=0.4x4x(16+9)
=0.4x4x25
=0.4x100
=40
Two mathematical problems
1. Use a 6 meter long rope to circle three times on a tree, and the remaining 0.348 meters to calculate the circumference of the trunk
2. If you can plant four flowers per square meter in a round flower bed with a diameter of 20 meters, how many seedlings do you need to plant this flower bed?
1. (6-0.348) / 3 = 1.884 (m)
2. According to the area algorithm, 3.14 * 10 * 10 * 4 = 1256 (trees)
(but if you are actually given a flower garden, for the sake of tidiness, if you plant 4 plants per square meter, then the spacing between each plant is 0.5 meters. It takes about 1268 plants to draw a grid for planting.)
N urgent! Ask for the formula!
The ratio of the length of a and B steel pipes is 3:7. It is known that the length of a pipe is 4.2 meters. How long is the length of B pipe?
4.2/x=3:7
3x=4.2*7
x=4.2*7/3
x=1.4*7
x=9.8
RELATED INFORMATIONS
- 1. Honghong dad's fruit shop brought in several kilos of bananas and pears of the same weight. Due to the abnormal weather, bananas are hard to store. When they are sold, bananas are sold at a quarter lower price, pears are sold at a quarter higher price. When they are sold, the price is 1.5 yuan per kilogram per day. Would you please calculate whether the fruit shop makes a profit or a loss when it brings in these fruits? (suppose the fruits are 500, 600, 1000 kg, etc.)
- 2. The students collected 16 kg of tree species in the fourth grade, 34 kg in the third grade and 12 kg in the sixth grade. How many kg of tree species were collected in the sixth grade?
- 3. If the function y = (1 / 3) ax ^ 3 - (1 / 2) ax ^ 2 (a is not equal to 0) is an increasing function in the interval (0,1), then the value range of real number a is
- 4. If the image of the function y = a ^ x + B-1 (a > 0 and a is not equal to 1) passes through the second and third quadrant, what must A.B satisfy
- 5. Let the function y = 4 ^ x * a + 2 ^ x + 1 hold when y > 0 is constant when x belongs to (- infinity, 1], and find the range of A
- 6. Find the domain of the function y = 2 ^ X-1 / 2 ^ x + 1, judge the monotonicity of the function and prove it by definition
- 7. Given that f (x) = ax ^ 2 + BX + 3A + B is an even function, its domain of definition is [a-1,2a], then the locus of point (a, b) is A. Point B. line C. line ray
- 8. If point (2,8) is on the image of power function y = f (x), then f (- 1) + F (1)=
- 9. How many powers of X will the m power of (- 1 / x) be equal to?
- 10. Use dichotomy to find a zero point of the function. The reference data are as follows: (1.6000)≈0.200 (1.5875)≈0.133 (1.5750)≈O.067 (1.5625)≈0.003 (1.5562) ≈ 0.029 (1.5500) ≈ 0.060 Therefore, an approximate solution (accurate to 0. OL) of the equation is obtained
- 11. 1. My uncle is going to dig a cylindrical swimming pool with a bottom diameter of 4 m and a depth of 1.5 m. the side and ground of the swimming pool should be plastered with cement. If the cement is 10 kg per square meter, how many kg of cement will be used? 2. There is a cone-shaped wheat pile with a total weight of 3717.76kg. It is known that the radius of the bottom of the pile is 2m. If the weight of each cubic meter of wheat is about 740kg, the height of the pile can be calculated
- 12. Several mathematical problems 1. Given a * b = (a + b) - (a-b), find the value of 9 * 2 2. A * b = 3A + 2b-1 (1) And find the value of 5 * 6 (2) And (3 * 4) * 2 3. If a * b = (a + b) × (a + b) - 1, find the value of 12 * 3 4、3#4=3+13+113+1113 2#3=2+12+112 (1) Find the value of 5 × 4 (2) If 6#x = 1254, find the value of X 5、 4@3=4 ×6×8 3@4=3 ×5×7×9 (1) , seeking 2@4 The value of (2) , known 9@y=1287 And find the value of Y
- 13. Two application questions, urgent! 1. For a project, Party A and Party B work together for 8 days. If Party A works alone for 6 days, and then Party B works for 9 days to complete the task, how many days does it take for Party B to complete the project alone? 2. For a project, Party A will complete it in 20 days, and Party B will complete it in 15 days. After five days of cooperation between the two teams, what are the remaining parts? To process, detailed! Urgent need! Please
- 14. As shown in the figure, the center O of the regular triangle ABC is exactly the center of the sector ode, and the point B is in the sector. No matter how the sector ode rotates around the point O, the area of the overlap between △ ABC and the sector is equal to 13% of the area of △ ABC. What is the central angle of the sector? Explain your reasons
- 15. Mathematics problems about circle It's a little harder
- 16. Two math problems, super urgent 1. A and B usually sell the same goods at the same price. During the Spring Festival, all goods in a mall are sold at a 20% discount. When the consumption amount in B mall exceeds 200 yuan, the excess part can be bought at this mall at a 70% discount. How to choose a mall to shop more economically? 2. In a cross-country race, when Xiao Ming ran 1600 meters, xiao gang ran 1450 meters. After that, they ran at the same speed of a meter / second and B meter / second respectively. After 100 seconds, Xiao Gang caught up with Xiao Ming, reached the finish line in 200 seconds, and reached the finish line in 300 seconds?
- 17. 1. The simplest common denominator of fractions 2 / x ^ 2-3x and 4x / x ^ 2-9 is () 2. Divide the fractions - 1 / (x-1) (x + 1), 2 / (x + 1) (x + 2), 3 / - (x + 2) (x-1) to get
- 18. A fifth grade math problem, answer before 9 o'clock tonight, additional reward! Put all 32 pears in the basket. How many pears can you put in each basket? How many pears can you put in each basket? The most pears in each basket
- 19. Answer a few math questions before 9:30. Thanks for your speed The four-year turnover of two department stores in a city is shown in the table below 2005 2007 2009 2010 First department store 7000 9600 11000 14000 The second department store 5000 7800 9200 13000 (2) In which of the four years, the turnover of the 100th company and the second department store is the closest? What percentage of the turnover of the second department store in 2007 is higher than that in 2005? The highest mountain in the world, Mount Qomolangma, is 8844m higher than sea level, which is often expressed as + 8844m. Then the height of sea level is () which is different from that of Mount Qomolangma () The results of one minute sit up test for boys and girls in a class are recorded below 15 times 16-24 times 25-32 times more than 32 times Boys 3 7 13 2 Girls 1 4 16 4 Among the students whose scores of 1 minute sit ups are 25 ~ 32 times, how many percent more are girls than boys (the percentage money is reserved for one decimal place) The number of boys is the most in the () times period, and the number of girls is the most in the () times period
- 20. A few math problems, help me solve them by tonight! 1. Xiao Ming goes shopping in the shop. Here is a dialogue between him and the aunt of the salesgirl Xiao Ming said, "I'll buy three of these toothpastes and five of these toothbrushes." The aunt of the salesman said, "it's 15 yuan and 60 cents in all." After payment, Xiaoming said: "Auntie, I don't want this toothpaste. Let's change a toothbrush." The aunt of the salesman said, "I'll give you 2 yuan back." Can you work out the unit price of toothpaste and toothbrush from their conversation?