How do you plant four trees to keep the distance between them equal?

If it is in a two-dimensional plane, there is no solution to this problem. Actually, this question is to cultivate people's three-dimensional thinking. Plant four trees on a plot of land so that the distance between every two trees is equal. The students drew one geometric figure after another on the paper.

Square, diamond, trapezoidal, parallelogram.

However, no matter what quadrilaterals are, they will not work. At this time, psychologists announced the answer, one of the trees can be planted on the top of a mountain! In this way, only the remaining three trees form a tetrahedron with it.

, you can meet the requirements of the topic. The reason these students thought about it for so long and couldn't find an answer was that they didn't learn to use a creative method called three-dimensional thinking. Three-dimensional thinking, also known as holistic thinking or spatial thinking, refers to the thinking method of investigating and studying the object of knowledge from multiple angles, directions, levels and disciplines, and trying to truly reflect the whole of the object of understanding and the three-dimensional picture composed of this whole and other surrounding things.

Three-dimensional thinking requires people to jump out of the limitations of points, lines, and planes, and consciously consider problems from all directions, that is, to "stand up and think".

1.Just pick up the tubes. Sky.

Gaussian algorithm)4. You will not burn me to death, you will divide me into five horses.5 On the four vertices of the positive triple flute cone.

8:30 a.m. and 8:30 p.m.; The speed of the ascent is slower than the descent of the mountain; There are two 3 4 places on a stretch of road.

1. The four vertices of a tetrahedron are at equal distances between any two vertices. Therefore, 4 trees can be planted according to the four vertex positions of the tetrahedron.

2. Before planting trees, you need to select fresh seedlings that have just been unearthed to ensure that there are no pests and diseases on the seedlings, so as to improve the survival rate of planting.

3. Before planting trees, backfill part of the cooked soil in the pit. In general, backfill cooked soil 20 to 30 cm. The saplings should be straightened, and after filling the soil, they should be stepped on around the tree. Fill in a layer of soil, try to make the tree pit lower than the ground, so that it is easy to water and maintain in the future.

4. After transplanting, the surrounding soil should be tamped with a shovel, or stepped on with a foot to help consolidate the roots and facilitate growth. You can also use three sticks to support the tree, so that the plant is stronger and can withstand wind and rain. Water thoroughly after planting and keep the soil moist at all times.

5. After the tree is planted, the temperature can be kept at 20-25, which is conducive to the growth of the root system of the plant and promotes the germination of leaves. If there is a large temperature difference between day and night, it is necessary to take measures to keep warm at night.

9-1=8 (trees).

9 + 8 = 17 (trees).

A: You can plant 8 more trees, and there will be 17 trees after planting.

9+8=17

A: You can plant 8 more trees, and there will be 17 trees after planting.

To plant two trees at equal distances, use a ruler to measure the location and dig a hole to plant.

Common trees are:Eucalyptus, banyan, pine,Mulberry treesWait.

Mulberry cultivation techniques

Comprehensive deep turning: 4000 to 5000 kg of soil miscellaneous fertilizer or farm fertilizer per mu before deep turning, and 30 to 40 cm deep turning;

Furrow turning: according to the planting method of furrow turning, 50 cm deep, 60 cm wide, topsoil, heart soil are set separately, 2500 to 5000 kg of soil miscellaneous fertilizer or farmhouse fertilizer per mu are applied on the ditch, 10 cm of topsoil, mix well. Deep Flip Time:

It can be done in November and December before planting.

Cultivation management. Planting density and form: 1000 to 1200 mulberry seedlings are transplanted per mu, and there are two planting forms:

Planting in wide and narrow rows: plots with good water and fertilizer conditions and flat plots are planted in wide and narrow rows, and transplanted in triangles to the air. It is required that the large row spacing is 6 feet, the small row spacing is 2 feet, and the plant spacing is 1 to 1 foot.

Equal row planting: Equal row planting should be used on terraces and gentle slopes with poor water and fertilizer conditions, with a row spacing of 4 feet and a plant spacing of up to a foot.

Varieties and seedling treatments:

The mulberry varieties were mainly agricultural mulberry series;

Seedling selection treatment: the seedlings are separated by size, planted separately, and the wilted roots and overly long roots are cut off before planting, and soaked in the mud to improve the survival rate.

Planting: It is required that the seedlings are positive, the roots are extended, the shallow planting is steady, and it is advisable to enter the soil about 10 cm at the grafting interface, water enough water to fix the roots, and cover the plastic film (3 feet wide and narrow row film, and 2 feet wide in equal rows).

Post-transplanting management:

Cut-off: After transplanting, 5 to 7 inches from the ground to cut off the seedling stem, winter planting for spring cutting, spring planting with planting, requiring smooth cut-off.

Thinning buds: When the new shoots grow to 4 to 5 inches, the buds are thinned, and each plant selects 2 to 3 mulberry buds with strong growth and reasonable direction to grow into strong branches.

Topping: For those with only one bud, when the buds grow to 4 to 6 inches, topping is carried out to promote their branching and early gardening.

Fill the gap: after the mulberry buds germinate, check in time, and replant those that do not survive in time.

Drainage and irrigation: water in drought and drain in rainy days to improve survival rate.

Strengthen weeding and fertilization: timely shallow tillage and weeding, apply 10 to 15 kg of urea per mu after thinning buds and heart, or watering biogas slurry, stool, etc., and the amount of fertilizer is mastered in 1 3 of the mulberry orchard.

Mulberry garden management. Tree type cultivation of young mulberry orchards: planting about 35 cm from the ground in the spring of the following year, leaving 2 to 3 stumps for each tree, and then cutting strips with this section every year, cultivating into a low-stem, fist-type or non-fist-type tree.

Cultivating and weeding: Cultivating is carried out once a year after the end of silkworm raising, and weeding is generally carried out 2 to 3 times a year according to the growth of weeds.

Fertilization: Fertilization is done four times a year.

Spring fertilizer: applied when mulberry buds germinate, 20 kg of urea per mu.

Summer fertilizer: After the end of spring silkworms, apply 20 kg of urea per mu and 25 kg of mulberry special compound fertilizer.

Autumn fertilizer: After the end of the dry autumn silkworm, 5 kg of urea per mu and 10 kg of mulberry compound fertilizer.

Winter fertilizer: applied in early December, apply 1500 to 2000 kg of farm fertilizer per mu.

We've probably never been close to each other.

Just two trees growing independently.

But I still have to thank you for the wind that day.

Let each other's leaves touch by chance.

It was an excessively soft feeling.

You are upright and kind, like a tree that grows straight up to the sky.

The song you hum is a summer carbonated drink.

It always makes me hear sweet bubbles.

You talk about what you love about basketball and travel like a child.

When it comes to the exploration of love and the world, he is like an uncle.

I know actually.

Your good temper towards everyone is also a kind of distance.

I can feel the sense of estrangement even when I'm close.

But even so, I'm willing to make a big tree with you.

Independent, free, and slippery, the scum yearns for sunshine and rain.

The other day you said that I didn't want you to be better.

My phrase "I hope you are okay with everything" is a sincere faith.

The previous sentence "I dislike" is false.

Hey, except for you.

No one I would be so happy and satisfied with.

Even if it's just the distance of two trees.

Because the distance between the two trees is 4 meters, and the fourth tree is separated from the sixth tree by the first five mountain reed trees, the total between the fourth tree and the sixth tree is 4+4=8 (meters).

1.It is not feasible to plant four trees on a flat field, that is, on a flat surface. When people are old, they can't plant small trees alone.

2.Flat ground is not good, is it because the title is wrong, no, in fact, there is a description of the rhomboid body in the three-dimensional geometry, that is.

The so-called regular rhombic vertebral body means that the three faces of the rhombic vertebral body are all regular triangles. Position the four trees at the four vertices of the terrain with a regular rhombic cone so that the distance between the two trees is equal.

Regarding the terrain of the rhombic vertebrae, I think there are two ways to achieve it, the first is to dig the soil, dig out a large pit of the rhombic vertebrae, and you can plant trees; The second is to pile the excavated soil into a hill with a rhombic vertebrae, and four such trees can also be planted.

The four vertices of a regular tetrahedron.