It is known that 50 people in the class have done five questions, of which the first question is wrong by four, the second by six, the third by nine, the fourth by two1and the fifth by 38.
1, PLA soldiers reclaimed a parallelogram vegetable field. Its bottom is 24 meters and its height is 16 meters. What is the area of this land?
2. Trapezoidal wheat experimental field with an upper bottom of 86m, a lower bottom134m and a height of 60m. How many square meters is its area? How many hectares?
3. Triangular land with a bottom height of 358m and a height of 160m. What is the area of this land? How many hectares?
Second, summarize the application questions
1. The People's Liberation Army Transportation Company transports a batch of coal. If each truck is loaded with 4.5 tons, it will take 16 cars to transport it at one time. If each truck is loaded with 6 tons, how many cars will it take to transport it all at once?
2. Students put flowers, each with 9 pots, which requires 36 people; If 18 people want to put it, how many pots should each person put?
Third, the application of three-step calculation method
Taiyanggou Primary School held a math knowledge contest. There are 60 participants in the third grade and 45 participants in the fourth grade. The number of participants in the fifth grade is twice that in the fourth grade. How many people took part in the competition in the third grade?
Fourth, meet the application problems
1, Zhang Ming and Li Hong set out from two places at the same time, facing each other. Zhang Ming walks 50 meters per minute and Li Hong walks 40 meters per minute. 12 minutes later, they met. How many meters are they apart?
2. The distance between Party A and Party B is 255km, and two cars leave both places at the same time. Car A travels 48 kilometers per hour and car B travels 37 kilometers per hour. Two cars meet in a few hours.
5. List simple equations to solve practical problems
Xiangqun Stationery Factory can produce 250 pencil boxes per hour. How many hours can you produce 10000?
2. The factory sent a batch of coal, burned 28 tons, and left 13 tons. How many tons is this batch of coal? (Answer in two ways)
Six, about the application of cuboids and cubes, the calculation of surface area and volume.
1, a rectangular iron box, length 18cm, width 15cm and height 12cm. How many square centimeters of iron does it take to make this iron box?
2. The side length of the cube is15cm. What is its surface area and volume?
1. Two trains leave from A and B at the same time, and meet at 48km after 4 hours. As we all know, the speed of the local train is five-sevenths that of the express train. What's the speed of the express train and the local train? How many kilometers is it between A and B?
2. With the cooperation of Party A and Party B, a batch of parts can be completed in 12 days ... After several days of cooperation, B asked for leave because of something, and B only completed three tenths of the total task. A went on doing it, and it took 14 days from the beginning to the completion of the task. Excuse me: How many days did A do it alone?
3. The construction of a section of highway was originally planned to be completed in 50 days for 120 people. After working for a month (calculated as 30 days), 20 people were transferred to repair other sections. How many days do the remaining staff need to work more than originally planned to complete the task?
1. What time does the train station clock strike? For example, 1 calls once, twice at 2 o'clock and once every half hour. How many times does this big clock strike every day and night?
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Two cars drive from a to b at the same time. The car travels more than the big car12km/h. The bus will arrive in B in 4.5 hours. It returns along the original road and meets the cart at 3 1.5 km at B. How many kilometers does the cart travel per hour? Amateur Boshu I K9DB t c
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4. Transport a batch of wheat with the same load, which is 5/6 of the total, 1 10 tons. How many tons are there in this batch of wheat?
Camping activities were held. At noon, the monitor went to the teacher in charge of logistics to get a bowl. The teacher asked, "How many people are there?" "One ***36." The monitor replied. Fans Boshu 4Y "k l5y" # E
The teacher said, "You can get it yourself, according to one person's rice bowl, two people's vegetable bowls and three people's soup bowls." This causes problems with the display. Can you help him?
6. There are 20 baskets of oranges, each weighing 27 kilograms. If each basket contains 1/9, how many kilograms is each basket? How many baskets can hold this basket of oranges?
7. A train can completely cross a 572-meter-long bridge in 64 seconds, while it only takes 20 seconds for the train to cross a tree on the roadside. How long is the train?
8. It takes 55 minutes for someone to travel from A to B at a speed of 12 km/h and from B to C, G and * * * at a speed of 9 km/h.. It takes 8km/yes to return from C to B, 4km/yes to return from B to A on Monday, and 1.5h to return to work. Find the distance between a and C.
An engineering team built a section of highway. A quarter of this road was built in the first week, and two-seventh was built in the second week. The second week is 2 kilometers more than the first week. How many kilometers is this road?
10. The distance between Party A and Party B is 240 kilometers. The speed of the car from Party A to Party B is 36 kilometers per hour, and the speed of the motorcycle from Party B to Party A is 24 kilometers per hour. 2.5 hours after the motorcycle leaves from Party B, the car also leaves from Party A. How many hours after the car leaves?
1 1. In order to meet the increasing demand of water consumption, Kunming recently built three water plants, A, B and C. The daily water supply of these three water plants is * *1/0.8 million cubic meters, of which the daily water supply of water plant B is three times that of water plant A and that of water plant C is/kloc-.
12. A football ticket 15 yuan. After the price reduction, the audience increased by half and the income increased by one fifth. How much is the price reduction?
13. A car travels from place A to place B within the scheduled time. If it is faster than the original regulation 12 km, it will arrive 39 minutes earlier, and if it is 8 km slower than the original regulation, it will arrive 39 minutes later. Find the distance between a and b.
14. Party A and Party B start from A and B at the same time and go in opposite directions. After meeting at a distance of 6 kilometers from B, they continued to move in the original direction. When they arrive at B and A respectively, they immediately return and meet at a distance of 4 kilometers. How many kilometers is the distance between A and B?
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It takes 20 days for Team A to do a job alone, and it takes 12 days for Team B to do a job alone. This work was first done by Party A for a few days, and then continued by Party B, and it took 14 days from beginning to end. Q: How many days did Party A and Party B do it?
16. There are 3200 chickens, ducks and geese on the farm. If chicken 1/3, duck 1/4 and goose 1/5 are sold, there will be 2400 poultry left. If you sell chicken 1/5 and duck 1/5.
6. One question: Party A and Party B visit the city. It takes Party A three hours to walk around the city. Now they both set off at the same time. It takes 4 hours for Party B to reach the original starting point after meeting with Party A, so as to find the time needed for Party B to walk around the city.
18. It is known that an iron bridge is 1000 meters long, and a train passes on the bridge. According to the measurement, it takes 1 minute for the train to get on the bridge, and it takes 40 seconds for the whole train to completely cross the bridge. Find the length and speed of the train.
19. A woman is washing dishes by the river. People saw her and asked her why she used so many bowls. She replied that there were many guests at home. They share a dish bowl for every two people, a soup bowl for every three people, and a rice bowl for every four people, and * * * used 65 bowls. How many guests are there in her house?
20. Xiaoming has a packet of biscuits, and the number of four, five and six is more than one. How many biscuits does Xiaoming have in this bag?
1.a and B are 460 kilometers apart. Two hours after the A train leaves from A, the B train leaves from B. Four hours later, it is known that the A train runs more than the B train 10 km/h. How many kilometers does the train run per hour on average?
2. Two cars leave from Party A and Party B at the same time. Two hours later, the two cars are still 200 kilometers apart. If the distance between Party A and Party B is 400 kilometers, how many hours will it take for the two cars to meet?
It takes 3 hours for the express train and 5 hours for the local train to go from city A to city B. If the local train travels 45 kilometers per hour, how many kilometers does the express train travel more than the local train?
It takes 12 hours for the express train to drive from A to B, and it takes 20 hours for the local train to arrive. If two cars leave from two places at the same time and the express train is 50 kilometers per hour, how long will it take for the two cars to meet?
5. Xiaohong, Xiaodong and Xiaoming walk in opposite directions from Party A and Party B. Xiaohong and Xiaodong travel from Party A to Party B at the speed of 70 meters and 80 meters per minute, and Xiaoming travels from Party B to Party A at the speed of 90 meters per minute. Two minutes later, Xiao Ming met Xiao Hong again. Excuse me: How many meters is there between A and B?
The distance between Party A and Party B is 8 kilometers. They both set out at the same time and walked in the same direction. Party A can catch up with Party B within 4 hours. Walk in opposite directions and meet within 1 hour. What is the average speed of two people?
There is a class of students watching movies in the open air, and the students are arranged to sit on benches. If four people sit on a bench, just five people have no seats. If five people sit on a bench, five more people can sit. Ask how many students there are in this class and how many benches there are.
A city has a population of 420 thousand. It is planned that after one year, the urban population will increase by 0.8% and the rural population will increase by 1. 1%, so that the population of the whole city will increase by 1%.
Xiaohong's family had a balance of 5000 yuan last year. It is estimated that the balance this year is 9,500 yuan, and the income this year is higher than last year 15%, and the expenditure is lower than last year 10%. What is the revenue and expenditure this year?
Prepare 15 kg of 60% brine, how many kilograms are taken from 70% brine and 55% brine respectively?
Last year, 5730 kilograms of wheat were harvested in two fields on the farm. After improved farming this year, the yield of the first plot increased by 10%, and that of the second plot increased by 8%. This year, the wheat yield reached 6,240 kg. How many Jin did these two plots harvest last year?
A company deposits 200,000 yuan with two different interest rates in the bank. The annual interest rate of deposit A is 1.4%, and that of deposit B is 3.7%. The company's annual income is 6250 yuan. How much are the deposits a and b?
Workshop A and Workshop B plan to process 360 parts in June 5438+10. Results workshop a exceeded 12%, workshop b exceeded 10%, and two workshops * * * processed 400 parts. How many parts were processed in each workshop in June+10, 5438?
The total output value of an iron and steel plant last year exceeded the total expenditure by 6 million yuan. The total output value of this year is 30% higher than last year, while the total expenditure is 20% lower than last year. Therefore, the total output value this year is 6.5438+million yuan more than the total expenditure. What was the total output value and total expenditure last year?
Mix 30% sugar water with 60% sugar water to make 30 kg of 50% sugar water. How much sugar water is used for each of the two concentrations?
The distance between a and b is 60 kilometers. A ship travels between A and B, and it takes 4 hours to sail downstream and 5 hours to sail upstream. Find the speed and current speed of the ship in still water.
A said to B: When I was your age, you were 5 years old, and when you were my age, I was 70 years old with you. How old are A and B this year?
The sum of the tenth digit and the second digit of a two-digit number is 7. If you add 45 to this two-digit number, it just becomes a two-digit number formed by the exchange of the number on the second digit and the number on the tenth digit. Find this two-digit number.
One factory produces one product. If 15 people do it by hand and two machines do it, 435 products can be made in one day. If 9 people do it by hand and 5 machines do it, you can make 7 17 pieces a day. How many pieces can each person make by hand and how many pieces can each machine make every day?
When the equations x= 1, 2 and -3, the values of y are 0, 3 and 28 respectively. When x=- 1, find the value of y.
A and b families. If A lets B run first 12 meters, A can catch up with B in 6 seconds. If B runs 2.5 seconds ahead of A, A can catch up with B in 5 seconds. What are the speeds of A and B respectively?
There are 66 workers, each of whom can process 15 type A parts or 12 type B parts every day. How many people should be arranged to process parts A and B so that three parts A can be matched with two parts B?
Party A and Party B each keep several account books. If Party A gives Party B 10, then Party B has five times as many books as Party A has left. If Party B gives Party A 10, then both parties have the same number of books, so how many books do each party have?
It takes 4 hours for someone to go from A to B and back to C by boat. It is known that the speed of the boat in still water is 7.5 km/h, and now the speed is 2.5 km/h. If the distance between A and C is 10 km, how many kilometers is there between A and B?