Construction of a rectangular swimming pool with a volume of 2,500 cubic meters and a depth of 2 met

Let the length of both sides of the bottom of the pool be a and b respectively. a*b=1250

Therefore, the total cost is 120 * ab + 2b * 80 + 2a * 80 = 150000 + 160 (a + b) > = 150000 + 80 root number a * b

If and only if a=b, the minimum value is obtained. That is, a=b= the total cost at this time is 150000 + 80 * root number 1250 151250 yuan.

If this is an elementary school problem.

The bottom area of the swimming pool is: 2500 2 1250 square meters.

Using the method of decomposing prime factors 1250 2 5 5 5 5, there are five possibilities for the length and width of the swimming pool 50

Their circumferences are: 2502 meters, 1254 meters, 510 meters, 270 meters, and 150 meters.

The side of the swimming pool is a large rectangle, and the side areas of the swimming pool are: 5004 square meters, 2508 square meters, 1020 square meters, 540 square meters, and 300 square meters.

Obviously, the smaller the surface area, the lower the cost of the pool wall.

120 1250 80 540 193200 yuan.

Upstairs is a genius, and if there really is a 1x1250 pool in the world, it is definitely on the Guinness Book of Records. For me, no matter where this pool is built in China, I will go for a swim, and it's so cool.

However, since it is only 1 meter wide, it is not suitable for butterfly swimming, which is a pity.

A rectangular swimming pool is 25 meters long, 15 meters wide and 20 dm. deepof this pool.

How many square meters does it occupy? If the perimeter and bottom of this pool are tiled, how many square meters of tiles will be needed? What is its volume in cubic meters?

20 decimeters = 2 meters.

Covers an area of 25 15 = 375 square meters.

Tile area 25 15 + (25 + 15) 2 2 = 375 + 160 = 535 square meters.

Volume 25 15 2 = 750 cubic meters.

For buildings, floor space refers to the horizontal projection area of the building.

Because it is a cuboid, the floor area is the bottom area.

1) Floor area: S bottom area. Length * Width.

375 (sqm).

2) Tile area: that is, to find the surface area of a cuboid without the top surface 20 decimeters = 2 meters.

S tile = 2 * side + 2 * front + bottom.

535 (sq.m.).

3) Volume: Use the box volume formula.

v Box = Length * Width * Height.

750 (cubic meters).

If you use the function to set the pool length x, then the width is 1200 (6*x) and set the cost y yuan y=2*6*x*95+2*6*[1200 (6*x)]*95+(1200 6)*135

y<=70000

Just solve it.

The size of a standard swimming pool is 1250 square meters, and the size of 8 such pools is about 1 hectare.

Answer: 1 hectare = 10,000 square meters.

10000 1250 = 8 (pcs).

The unit symbol of the hectare is represented by hm, where hm means 100 meters, and the meaning of hm is the square hectometer of 100 meters, which is 10,000 square meters, that is, 1 hectare. In addition, hectare can also be represented by ha, which is the English abbreviation of hectare, the unit of area.

1. (50+30) 2=160 meters.

2. The area to be pasted = 50 30 + (50 + 30) 2 2 = 1500 + 320 = 1820 square meters.

4 dm = m.

Requires 1820 tiles (block.)

30 2 = 3000 cubic meters.

Have fun.

1.If you walk around the pool, you have to walk at least 160 meters.

2.If you put square tiles with a length of 4 decimeters on the four walls and bottom surface of the swimming pool, then you need 2 * (500 + 300) * 200 4 * 4 + 500 * 300 4 * 4 = 57,500 such tiles.

3.To excavate this swimming pool, it is necessary to dig out 50 * 30 * 2 = 3000 cubic meters of soil.

Rice;

Calculation of the perimeter of the top surface of the cuboid: 50 + 30 + 50 + 30 = 160 meters.

Block; Calculation of the area of 5 faces of the cuboid topping: 50 30 + 50 2 2 + 30 2 2 = 1820 square meters; Single square tile area: square meters; Number of blocks:

1820 blocks. If it is actually built, there need to be spare tiles to make up for the loss during construction.

Cubic metre; Cuboid volume calculation: 50 30 2 = 3000 cubic meters.

1.At least =2 (50+30)=160 meters.

2.Area = 50 30 + 2 (50 + 30) 2 = 1820 square meters of tiles = 1820 (blocks.

3.Need = 50 30 2 = 3000 cubic meters.

1. (50+30) 2=160 meters.

2. The area to be pasted is 50 * 30 = 1500 square meters (50 * 2 + 30 * 2) * 2 = 320 square meters, 1500 + 320 = 1820 square meters.

4 dm = m.

Requires 1820 tiles (block.)

30 2 = 3000 cubic meters.

The first question: (50+30)*2=160 meters.

Second question: 50*2+30*2=160 square meters 160 divided by blocks.

The third question: 50 * 30 * 2 = 3000 cubic meters.

Note: * is the meaning of multiplication.

2700 square meters

The area of this swimming pool is 1500 square meters.