Column inequalities to solve practical problems If the sum of three consecutive positive even numbers is less than 13, what is the product of the three even numbers Pay attention to "column inequality system"
It's very simple. You set the smallest one as X, and list it according to the meaning: x + X + 2 + X + 4
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- 1. In order to support the reconstruction of the earthquake stricken area of Yushu, Qinghai Province, a company rented eight trucks of different models a and B to transport 250 cases of drugs and 370 cases of daily necessities to Yushu, Qinghai Province. It is known that a type a truck can transport 30 cases of drugs and 50 cases of daily necessities, and a type B truck can transport 50 cases of drugs and daily necessities Supplies 40 cases. What kind of car rental scheme do you have? Please help to design it
- 2. Column inequalities to solve application problems A type a pump, which can pump 1.1 tons of water per minute, can pump water in half an hour. If B type pump is used, it is estimated that it can pump water in 20 minutes. How many tons more water can b type pump pump pump pump than a type pump per minute Use the system of linear inequalities of one variable to solve it! Using a type a pump which can pump 1.1 tons of water per minute to pump the pool can be finished in half an hour; if using B type pump, it is estimated that it can be finished in 20 to 22 minutes. How many tons more water can be pumped by B type pump than a type pump per minute? I'm sorry,
- 3. In a sales promotion, a store stipulates that consumers can enjoy a discount if they spend more than 200 yuan or more. A classmate buys a prize for his class and plans to buy 6 albums and several pens. It is known that each album costs 15 yuan and each pen costs 8 yuan. How many pens can he buy at least to get a discount?
- 4. How to solve the application problem of inequality If we use the existing chemical fertilizer to fertilize the paddy field, if we use 50 kg per hectare, then there is still 80 kg less; if we use 40 kg per hectare, then there is 220 kg more?
- 5. In order to build a "Scholarly Campus", a school plans to use no more than 1900 science and technology books and 1620 personal literature books to set up a total of 30 small and medium-sized book corners. It is known that to set up a medium-sized book corner, 80 science and technology books and 50 humanities books are needed; to set up a small book corner, 30 science and technology books and 60 humanities books are needed. (1) what are the construction plans in line with the theme How many? Please help the school design; (2) if the cost of setting up a medium-sized book corner is 860 yuan, and that of setting up a small book corner is 570 yuan, which one is the lowest in (1)? How much is the minimum charge?
- 6. Practical problems (solved by inequality) There is a group of monkeys, a total of 149, one day to steal peaches, peach, if each monkey points five, then there is a monkey points Taenia less than five, you can find at least a few monkeys?
- 7. A higher one solution absolute value inequality |X | > | a | is equivalent to A. X > plus or minus a B.-a
- 8. Ask for help to solve a high one absolute value inequality 5<|2X+3|+X≤11 Hope to attach a detailed solution
- 9. The solution of three higher absolute value inequalities 1、|ax+b|>c,(c>0) 2、28
- 10. |2x+3|-|2x-5|>6 How to solve excuse me? Had better say specific point amount |1-2x | / | x | > - 1 also help.
- 11. An elementary one column inequality system to solve application problems Both a and B run on the arc Road at the same speed. If they start from the same place at the same time and walk in opposite directions, they meet every two minutes. If they walk in the same direction, they meet every six minutes. It is known that a runs faster than B, how many laps do a and B run in each minute?
- 12. The system of inequalities in the application of inequalities The purchase price of a commodity is 150 yuan. When a merchant sells such a commodity, the profit of the commodity is 10% to 20% of the purchase price. What's the price range?
- 13. An applied problem of inequality system Xiexie, thank you
- 14. Application of two inequalities in the first grade of junior high school 1. It takes 10 hours for a ship to travel from a place in the upper reaches of a river to B place in the lower reaches at a constant speed, and less than 12 hours to return from B place to a place at a constant speed. The water velocity of this section of the river is 3km / h, and the still water velocity V of the ship to and fro remains unchanged. What conditions does V meet? 2. Lao Zhang and Lao Li bought the same number of breeding rabbits. One year later, the number of breeding rabbits raised by Lao Zhang increased by 2 compared with the number of breeding rabbits bought by Lao Li. Lao Li raised one less than twice the number of breeding rabbits bought by Lao Zhang, and the number of breeding rabbits raised by Lao Zhang did not exceed 2 / 3 of Lao Li's. how many breeding rabbits did Lao Zhang buy at least a year ago?
- 15. 1. The purchase price of apple is 3.8 yuan per kilogram, and it is estimated that 5% of the apples are in normal loss. In order to avoid losing money, how much yuan per kilogram should the seller price at least? 2. It is known that the solution set of inequality (2a-b) x + a-5b > 0 about X is x < 10 / 7. Find the solution set of inequality ax > b about X
- 16. 1. A store needs to purchase a batch of TV sets and washing machines. According to the market survey, it is decided that the purchase quantity of TV sets is not less than half of that of washing machines. The purchase price and selling price of TV sets and washing machines are as follows: Category TV washing machine Purchase price (yuan / set) 1800 1500 Price (yuan / set) 2000 1600 Plan to buy 100 TV sets and washing machines, the store can raise up to 161800 yuan (1) Can you help the store to figure out how many kinds of purchase plans there are (2) Which purchase plan will get the most profit when the TV set and washing machine are sold in the store? And find out the most profit. (profit = selling price purchase price) 2. In 2007, a county in our city was preparing for the 20th anniversary of the county celebration. The garden department decided to use the existing 3490 pots of A-type flowers with a and B-type gardening models, a total of 50, placed on both sides of Yingbin Avenue. It is known that 80 pots of A-type flowers, 40 pots of B-type flowers, 50 pots of A-type flowers and 90 pots of B-type flowers are required to match A-type flowers (1) The extracurricular activity group of class 1, grade 9 of a school undertook the design of this gardening modeling matching scheme. How many matching schemes are there? Please help to design them (2) If the cost of matching a model a is 800 yuan, and that of matching a model B is 960 yuan, try to explain which scheme in (1) has the lowest cost? What is the lowest cost? The answer should be before 21:00:00 on May 30, 2009. Those who know the answer should answer immediately
- 17. I'm going to ask questions - solving inequality problems~ Give a pile of apples to several children. If each child gets three apples, there will be eight. If no one gets five apples, there will be less than three apples for the last one By four o'clock
- 18. Ask an inequality application problem, kneel down to seek progress! There are 15W books in the library, and a group is arranged to carry the books every day. A total of 1.8W books are moved in two days, and each group is required to carry the same number of books in seven days. How many groups should be arranged at least every day in the next few days? I don't know why the answer is 2.9. How should I list it? I am 1.8 + (0.9 * 5) x > 15
- 19. Does the number axis need origin when solving inequality system?
- 20. Solve the following Fractional Inequality (Mathematics of grade one in senior high school) three problems (1) (2x + 5) > 1 (2) 2 / 3-5X is greater than or equal to 3 (3) X square + X + 1 / 2 (- 2x + 5)