Our troops stopped the enemy at a bridgehead. When they set out, the enemy was 24 kilometers away from the bridgehead, and our troops were 30 kilometers away from the bridgehead. Our troops marched quickly, and the speed was 1.5 times that of the enemy. As a result, they arrived 48 minutes earlier than the enemy, so we asked for the speed of our troops

Suppose the enemy's speed is x km / h, our army's speed is 1.5x km / h, 24x = 301.5x + 4860, x = 5. After testing, x = 5 is the solution of the equation. 5 × 1.5 = 7.5. Our army's speed is 7.5 km / h

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1. Application of fractional equation There are two roads from Beibei's home price to the school, each of which is 3km. The first road is a flat road, the second road has an uphill road of 1km, and the second road has a downhill road of 2km. Beibei's riding speed on the uphill road is vkm / h, on the flat road is 2vkm / h, and on the downhill road is 3vm / h 1. When taking the second road, what is the speed from home to school? 2. Please help him figure out which way to take and how long to take?
2. On the application of fractional equation In order to maintain the balance between food production and natural ecology, China began to implement the policy of "returning farmland to forest" in 2000. In small villages, the original cultivated land is 600 hectares and the forest land is 150 hectares. It is planned to turn part of the cultivated land into forest land, so that the forest land area accounts for 80% of the cultivated land area?
3. Junior high school fraction problem. Prawn save There are four questions altogether (1) Given that a + 1 / b = B + 1 / C = C + 1 / A, and a ≠ B ≠ C, can you find the square of a multiplied by the square of B multiplied by the square of C? Please give the reason (2) A ship goes back and forth between port a and port B. from port a to port B, it goes along the water, and from port B to port a, it goes against the current. It is known that the speed of the ship in still water is 8km / h, and the time ratio of sailing against the current is 2:1. One day, it happens to be a rainstorm, and the speed of the current is twice that of the original. This ship goes back and forth for 9h. How far is the distance between port a and port B? (3) In order to speed up the western development, an Autonomous Region decided to build a new highway, which was contracted by Party A and Party B. If Party A works alone, it will be completed on schedule; if Party B works alone, it will take six months to complete. Now Party A and Party B work together for four months, and the rest will be constructed by Party B alone, How long does it take to build this road? (4) The buyer of a shopping mall predicted that a commodity would sell well in the market, so he used 80000 yuan to buy the commodity. After the commodity was put on the market, it was in short supply. The shopping mall used 176000 yuan to buy the second batch of this commodity, which was twice as much as the first batch. However, the unit price of the purchase was 4 yuan more expensive. When the shopping mall sold the commodity, the price was 58 yuan for each piece. Finally, the remaining 150 pieces were sold at a 20% discount and sold out quickly, How much is the total profit of the mall? So many topics Because I know my score is not very much Just ask the prawns to do as much as they can Because it's urgent
4. Xiao Zhang is walking at a constant speed on the ring road. Every four minutes, a bus meets him head-on. Every 12 minutes, a bus of the same route runs from his back to his front. How many minutes does the bus stop send a bus?
5. Complete square formula and square difference formula 1、 Given: a + B = 10, ab = 20, find the value of the following test: (1) a ^ 2 + B ^ 2 (2) (a-b) ^ 2 2、 If x ^ 2 + MXY + 4Y ^ 2 is a complete square test, find the value of M. 3、 Calculate 2004 ^ 2 - 2003 ^ 2 + 2002 ^ 2 - 2001 ^ 2 + +4^2 - 3^2 + 2^2 - 1 = Thank you very much
6. A = (7 / 3) to 1004, B = 3 to 2008, C = 15 to 2008 D = 7 to the power of 2008, e = 35 to the power of 2008 f=（b+c）/（d+e） g=√f Calculation: a * g (in fact, the original problem is direct calculation. There is no abcdefd. The main problem is that the numbers and symbols are not easy to input with the keyboard and you can understand them.)
7. Given ABC ≠ 0, a + B + C = 0, find the value of a × (1 of B + 1 of C) + B × (1 of C + 1 of a) + C × (1 of a + 1 of B)
8. It is known that the x power of 25 is 2000 Y power of 80 = 2000 Find the value of: 1 / x + 1 / Y
9. 1 2 3 —— + —— - —— = 0 x-1 x+2 x-3
10. A brief calculation of 50 mathematics problems in grade five of primary school
11. Application of fractional equation Xiaoming and Xiaoxiao input Chinese characters. Xiaoming input 900 words and Xiaoxiao input 1200 words in the same time. We know that each of them input 210 words per minute. Can you work out how many words each of them input per minute?
12. Application of fractional equation in junior high school Party A and Party B type a manuscript together. After 4 hours, Party A has another task, and Party B will type another 6 hours to complete the task? Notice the fractional equation!
13. On the application of fraction in Mathematics It is known that the new method can complete the task that the common method can complete in 2 hours. If the two methods are used independently, how many hours can they complete the task?
14. Xiao Wang and Xiao Li come to a grain store twice a month to buy rice at the same time. The price of rice has changed twice. The price of rice is x yuan / kg for the first time and Y yuan / kg for the second time?
15. Two hours after the Wenchuan earthquake, an armed police unit set out from XX County for rescue. They left at 1:15 a.m. on the 13th, but they met with trouble on the way. They decided to walk, but they were delayed for an hour because of saving people in Dali County. Then, they sent a detachment to increase the walking speed by 1 / 9. They arrived in Wenchuan at 23:15 on the 13th~ What is the average speed of the advance team from Lixian to Wenchuan? I'll add it! Also ask the time from the beginning to Lixian, the speed and time from Lixian to Wenchuan (this is the table) It's 30 kilometers from Lixian to Wenchuan and 60 kilometers from Lixian to Wenchuan It is the time from XX county to Li County, the speed and time from Li county to Wenchuan What is the average speed of the advance team from Lixian to Wenchuan? ``````````````````````````````````````````````````````````` Dizzy``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
16. Mathematical application problems. Equations to be listed. Fractional application The speed ratio of a to B is 2:3. The distance from a and B to C is 10.5 km and 12 km respectively. If a starts one hour earlier than B, it can arrive 30 minutes earlier than B. how much speed can a and B walk?
17. Who has the problem and answer of fractional equation?
18. A calculation problem of mathematical fractional equation (x ^ 2 + 7x-8) / (x-1) + (x ^ 2 + X + 3) / (x + 2) + (2x ^ 2-x + 7) / (x + 3) = 4x, find the value of X I've solved it many times, but I can't get the answer
19. A. The distance between city B and city a is 50 kilometers. City a starts from city a by bike to city B. one hour and 30 minutes later, city B starts from city a by motorcycle to city B. It is known that the speed of city a is 2.5 times that of city B, and city B arrives one hour earlier than city A. what are the speeds of city a and city B?
20. Second volume of junior high school fractional application problems In a rice field of a hectare, if one person transplants rice, it will take M days to complete; if one transplanter works 3 days earlier than 10 people transplanting rice, how many times is the work efficiency of one transplanter than that of one person?