(1) If both ends of a tree are planted, then * * * needs _ _ _ _ seedlings;
(2) If no trees are planted at both ends, * * * needs _ _ _ _ seedlings;
(3) If only one plant is planted, then * * * needs _ _ _ _ seedlings;
2. There is a rectangular flower bed, 20 meters long and 10 meters wide. Four pairs of pine trees were planted in four corners. If a winter jasmine is planted every 2 meters between the pine trees around the flower bed, * * * will plant _ _ _ _ _ _.
3. A carpenter saws a piece of wood with a length of 13m. He sawed a damaged part 1 m first, then sawed it five times and sawed it into many short pieces of wood with the same length. Each short piece of wood is _ _ _ _ meters long.
The clock strikes four times at four o'clock, and it takes 12 seconds to strike. Then knock 6 times at 6 o'clock and knock it out in _ _ _ _ seconds.
5. Plant a plane tree every 8 meters on one side of the road, and Xiaojun will ride for 5 minutes * * * and see 25 1 tree. Xiaojun rides _ _ _ _ meters every minute.
It takes Xiaoming 4 minutes to run from the first floor to the fifth floor. Xiao Fang's speed is half that of Xiao Ming, and it takes Xiao Fang _ _ _ _ minutes to run from the first floor to the fourth floor.
7. A class of students happened to stand in an 8×8 square in the performance of the military training team. If these students are allowed to stand guard on a 250-meter-long straight road, starting from one end and standing every 5 meters, there will be _ _ _ _ people left after the station is full.
8. An athlete runs a marathon. It took * * * 50 minutes from seeing the first tea station to seeing the third tea station. It is known that the interval between every two tea stations is 5 kilometers from the starting point to the end point. It took him three hours to finish the race. How many kilometers is the marathon?
9. A 3-meter-long steel pipe, starting from one end, is 30 cm long and then 20 cm long, so that the length is sawed into small pieces alternately. How many sections can be sawed to 30 cm long? How many segments are there in 20 cm long? If each section is sawed for 8 minutes and rested for 2 minutes after sawing, how many minutes will it take to finish sawing?
10. On a wooden stick with a length of 100 cm, point a red dot every 6 cm from left to right and every 5 cm from right to left. How many paragraphs are there between two 4 cm long red dots?
1 1. There is a trapezoidal rice field, which consists of three equilateral triangles with a side length of 20 meters, as shown in Figure 3. In order to prevent birds from stealing rice, from the end of each line segment, stand a dummy every 2 meters. How many dummies can a * * * stand?
Select the type first, and then answer continuously.
12. In the primary school students' broadcast exercise queue, one row is 26 meters, and the distance between two adjacent students is 2 meters. How many students are there in this column? Belong to () ① Double-ended species ② Single-ended species ③ Endless species.
There are () students in this column.
13. In order to welcome Children's Day on June 1, the school is going to place flowers on both sides of the road 60 meters in front of the teaching building (one end is not placed against the wall), and the distance between two adjacent potted flowers is 3 meters. How many potted plants does a * * * need? Belong to ()
① Plant at both ends; ② Plant at one end; ③ Plant at both ends.
A * * * needs () potted flowers.
14, a piece of wood, should be divided into five sections on average. It takes 8 minutes to saw the next section, and how many minutes does it take to see the next section?
Belong to () ① Double-ended species ② Single-ended species ③ Endless species.
It takes () minutes to finish sawing. Agree 0| Comment
2011-1-kloc-0/-0/5 Find the problem of tree planting in primary school mathematics 4 All formulas 20 1 1-8-27? 1May 28, 2008 There is a problem of planting trees in primary school mathematics 32 July 28, 2008 -3 1, there is a problem of planting trees in primary school mathematics 34 20 14, and there are more problems about planting trees in primary school mathematics >>
Tree planting problem: exercise tree planting problem: formula tree planting problem: Olympic tree planting problem: application question 20 1 1-8- 16 tree planting problem around 2520 10-7-9 tree planting problem, please answer120/kloc. Thank you for practicing tree planting on August 23, 2009. More questions about planting trees: exercises >>
Other answers ***3 items 2011-12-1815:14 Mimi 666 | Level 2.
Tree planting problem
1. Next to a section of 100-meter-long passage, from beginning to end, insert a red flag every 10-meter. * * * How many sides should I insert?
The distance between the two buildings is 20 meters. How many pine trees can be planted every 4 meters?
There is a round flower bed, and it is 60 meters to walk around it. If you plant a lilac every 6 meters along this circle, you can
How many lilacs were planted?
4. Around a reservoir, there is a levee with a perimeter of 100 meters. Plant a willow tree every 10 meter on the levee, and then plant two adjacent levees.
How many willows and peach trees should be prepared for planting a peach tree every 5 meters between willows?
The distance between Party A and Party B is 60 meters. Six trees were planted between the two places. What is the distance between every two trees?
6. Plant 10 trees around the annular flower bed. The distance between two trees is 3 meters. How many meters are there around the round flower bed?
7. Two rows of trees were planted between two buildings separated by120m, and 22 trees were planted in one row. What is the distance between two adjacent trees?
8. There are 5 trees on each side around the square pond, and all four corners should be planted with 1 tree. A * *, how many trees have been planted?
Trees?
9. During the morning rush hour, 1 buses run every 10 minutes. How many times do you need to drive every 1 hour? 10. The length of a rope 12 cm. Cut it into 3 cm long sections. How many sections can you cut? How many times do I have to cut it? If it takes 2 seconds to cut once, how many seconds does it take to cut once?
1 1. A piece of wood is 80 cm long, and it takes 28 minutes to saw it into short pieces of 10 cm each. How many minutes will it take if it is sawed into small pieces of 20 cm each?
12. Xiaoming and Xiaohong live in the same building. There are 20 steps between each floor. Xiao Ming lives on the second floor and Xiao Hong lives on the fifth floor, Xiao Ming thinks.
How many steps does it take to go to Xiaohong's house to play with her? Tree planting practice
1. The school has a 60-meter-long sidewalk and plans to plant trees along the roadside. Plant a tree every 3 meters.
(1) If both ends of a tree are planted, then * * * needs _ _ _ _ seedlings;
(2) If no trees are planted at both ends, * * * needs _ _ _ _ seedlings;
(3) If only one plant is planted, then * * * needs _ _ _ _ seedlings;
2. There is a rectangular flower bed, 20 meters long and 10 meters wide. Four pairs of pine trees were planted in four corners. If a winter jasmine is planted every 2 meters between the pine trees around the flower bed, * * * will plant _ _ _ _ _ _.
3. A carpenter saws a piece of wood with a length of 13m. He sawed a damaged part 1 m first, then sawed it five times and sawed it into many short pieces of wood with the same length. Each short piece of wood is _ _ _ _ meters long.
The clock strikes four times at four o'clock, and it takes 12 seconds to strike. Then knock 6 times at 6 o'clock and knock it out in _ _ _ _ seconds.
5. Plant a plane tree every 8 meters on one side of the road, and Xiaojun will ride for 5 minutes * * * and see 25 1 tree. Xiaojun rides _ _ _ _ meters every minute.
It takes Xiaoming 4 minutes to run from the first floor to the fifth floor. Xiao Fang's speed is half that of Xiao Ming, and it takes Xiao Fang _ _ _ _ minutes to run from the first floor to the fourth floor.
7. A class of students happened to stand in an 8×8 square in the performance of the military training team. If these students are allowed to stand guard on a 250-meter-long straight road, starting from one end and standing every 5 meters, there will be _ _ _ _ people left after the station is full.
8. An athlete runs a marathon. It took * * * 50 minutes from seeing the first tea station to seeing the third tea station. It is known that the interval between every two tea stations is 5 kilometers from the starting point to the end point. It took him three hours to finish the race. How many kilometers is the marathon?
9. A 3-meter-long steel pipe, starting from one end, 30 cm long, and then 20 cm long, is sawed into small pieces alternately. How many sections can be sawed to 30 cm long? How many segments are there in 20 cm long? If each section is sawed for 8 minutes and rested for 2 minutes after sawing, how many minutes will it take to finish sawing?
10. On a wooden stick with a length of 100 cm, point a red dot every 6 cm from left to right and every 5 cm from right to left. How many paragraphs are there between two 4 cm long red dots?
1 1. There is a trapezoidal rice field, which consists of three equilateral triangles with a side length of 20 meters, as shown in Figure 3. In order to prevent birds from stealing rice, from the end of each line segment, stand a dummy every 2 meters. How many dummies can a * * * stand?
Select the type first, and then answer continuously.
12. In the primary school students' broadcast exercise queue, one row is 26 meters, and the distance between two adjacent students is 2 meters. How many students are there in this column?
Belong to ()
① Plant at both ends; ② Plant at one end; ③ Plant at both ends.
There are () students in this column.
13. In order to welcome Children's Day on June 1, the school is going to place flowers on both sides of the road 60 meters in front of the teaching building (one end is not placed against the wall), and the distance between two adjacent potted flowers is 3 meters. How many potted plants does a * * * need?
Belong to ()
① Plant at both ends; ② Plant at one end; ③ Plant at both ends.
A * * * needs () potted flowers.
14, a piece of wood, should be divided into five sections on average. It takes 8 minutes to saw the next section, and how many minutes does it take to see the next section?
Belong to ()
① Plant at both ends; ② Plant at one end; ③ Plant at both ends.
It takes () minutes to finish sawing.
It took Xiaojun six minutes to walk from the first floor to the third floor. According to this calculation, how many minutes does it take him to walk from the first floor to the ninth floor?
The circular runway is 400 meters long. If a warning sign is erected every 10 meter, how many warning signs does * * * need?
3. Plant 95 trees at one side and two at the other. The distance between every two trees is 5 meters. What is the total length of this section of highway?
The road in front of the park gate is 80 meters long. Poplars should be planted on both sides of the road, and every two trees should be separated by 8 meters (both ends should also be planted). How many trees does the gardener need to prepare?
There is a square flower bed in front of the school library. There are 12 potted plants on both sides of the outermost layer of this flower bed. How many pots of flowers are put on the outermost layer? How many potted plants does this flower bed need?
Second, improve the problem.
1. A snail climbs from the bottom of a well 30 cm deep, and it takes 3 minutes to climb every 5 cm, and then rests 1 minute. How many minutes does it take to climb out of the wellhead?
2. Zhang planted trees around the contracted square pond. The side of the pond is 60 meters long, and a lesson is planted every 5 meters, one lesson in each corner. Is it enough for Zhang to buy 50 seedlings?
3. The wall clock strikes 1 at 1, 3 at 3: 00 and 12 at 12. When this wall clock strikes 3 o'clock, it takes 4 seconds. 12 How many seconds does it take to knock 12?
There are 60 children playing games around a square, so how many students should stand on each side? if
What about the Pentagon? How about a hexagon?
A child walks on the road at the same speed, and it takes 16 minutes to walk from the first tree to the seventeenth tree. If the child walks for 30 minutes, which tree should he walk to?
6. Jingjing is arranged into three layers of hollow squares with Weiqi pieces, and each side of the outermost layer has 14 Weiqi pieces. How many pieces does Jingjing use to put this square?
7. In the program, there is a square flower bed in the center of the square. There are chrysanthemums on the third floor outside the flower bed. There are 10 pots on both sides of the outermost layer. A * * *, how many pots of chrysanthemums? If you put 20 pots on each side of the outermost layer, how many chrysanthemums will you put in one pot?
8. This is a picture of the Olympic rings composed of potted flowers. The circumference of each ring is 65,438+00 meters. Place a pot of flowers every 5 minutes and a pot of flowers at each intersection. How many potted flowers does this Olympic five-ring map need?
9. Plant trees at equal intervals on the road. Both parties start from a tree at one end of the road at the same time. When Party A came to the 22nd tree counted from his side, Party B just came to the 10 tree counted from his side. It is known that Party B walks 36 meters per minute. Q: How many meters does Party A walk per minute?
10. On a wooden stick with a length of 100 cm, point a red dot every 6 cm from left to right. Dot a red dot every 5 cm from right to left. How many segments are there between two red dots with a distance of 4 cm?
There are 4 1 flags on one side of the runway, and their interval is 3 meters. Now, instead of just inserting 3 1 sign, how many meters should the interval be changed?
1. Plant trees around a rectangular land with a length of100m and a width of 80m. Plant a tree and 20 trees every few meters. Find the distance between every two trees.
2. plant trees on both sides of a 250-meter-long road, both at the starting point and the end point. A * * * planted 102 tree, and the distance between every two adjacent trees was equal. Do you know how many meters it is?
3. All the fourth-grade students take part in the radio exercise competition, which is divided into four groups, 230 meters long, and the distance between each team is 2 meters. How many students are there in the fourth grade?
There are 320 pots of chrysanthemums arranged in 8 rows. The distance between two adjacent chrysanthemums in each row is 1 m. What is the length of each row of chrysanthemums?
There is a piece of wood 20 meters long. First cut off the 2-meter-long damaged part, then cut the remaining wood into strips of the same length and saw it five times. How long is each paragraph?