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A cuboid food box is 10 cm long, 8 cm wide and 12 cm high. Stick a circle of brand paper around it. How many square centimeters should the area of brand paper be at least?
Is to find its side area, that is, the area of four faces
10 × 12 × 2 + 8 × 12 × 2 = 432 (square centimeter)
A circle of trademark paper is pasted around a rectangular food box with a length of 1 decimeter, a width of 8 cm and a height of 1.5 decimeters. The trademark joint is 1 cm. What is the area of the trademark paper
Fast, I want to tutor! Urgent!
1dm=10cm 1.5dm=15cm
(10+8)*2=36
(36 + 1) * 15 = 555 (cm2)
The speed ratio of car a and car B is 4:7. The two cars are going from two places at the same time, and they meet at 15km from the midpoint. How many kilometers is the distance between the two places?
(15 × 2) / (7-4) = 10 (km)
10 × (4 + 7) = 110 (km)
It is known that the waist length of an isosceles triangle is 5 cm and the area is 10 square cm. Find its base length
Pythagorean theorem,
Let the length of the bottom edge be B and the height be H
be
bh/2=10.(1)
b^2+h^2=5^2.(2)
Substituting (1) into (2) and simplifying
b^4-100b^2+1600=0
Let B ^ 2 = k then
K ^ 2-100k + 1600 = 0
k1=20,k2=80
∴b1=2√5
B2 = 4 √ 5 (rounding off negative value)
How to move two points in ABC to have the same number represented by three points? A means - 4, B means - 2, C means 3
There are three points ABC on the number axis, a = - 3, B = - 1, C = 4. How to move the two points of a, B, C to make the numbers represented by the three points the same? There are several ways: A does not move, B moves 2 units to the left,
The tree planting team plans to plant a row of trees on both sides of a 100 meter long road. A total of 52 trees will be planted on both ends of the road. On average, every two adjacent trees should be separated from each other______ Rice
The average distance between two adjacent trees should be 4 meters. So the answer is: 4
What is the area ratio of a square and a circle with equal perimeter?
Square perimeter 4A = C
a=C/4
Circle circumference 2 π r = C
r=C/2π
the measure of area:
S positive = a ^ 2 = C ^ 2 / 16
S circle = π R ^ 2 = C ^ 2 / 4 π
So the area ratio is 4 π / 16 = π / 4
If x and y are positive integers, and the x power of 2 × the Y power of 2 = the 5th power of 2, then there are several pairs of values of X and y
X power of 2 × y power of 2 = 5 power of 2
x+y=5
x=1 y=4
x=2 y=3
x=3y=2
x=4 y=1
Then the values of X and y have (4) pairs
For the promotion of Zhongshang Plaza, if the value of the purchased goods is more than 200 yuan, a lottery ticket will be issued, and 2000 tickets will be issued until the end of the sales. There are 20 first prizes with the value of 800 yuan, 30 second prizes with the value of 500 yuan, 100 third prizes with the value of 100 yuan______ %If all the lottery tickets are issued, at least they are sold______ Yuan goods, the amount of prize accounts for at most 30% of the sales______ %．
① Winning rate: 20 + 30 + 1002000 × 100% = 1502000 × 100% = 7.5%; ② 200 × 2000 = 400000 (yuan); ③ 20 × 800 + 30 × 500 + 100 × 100, = 16000 + 15000 + 10000, = 41000 (yuan), 41000 △ 400000 = 10.25%; so fill in: 7.5; 400000; 10.25
The figure below is an expanded cuboid. What is the surface area and volume of the carton
The surface area uses three numbers 14, 10, and 7
（14*10+14*7+10*7）*2
＝（140+98+70）*2
＝308*2
= 616 square centimeters
RELATED INFORMATIONS
- 1. In a cylindrical bottle with a bottom radius of 10 cm, the water depth is 8 cm. To put a piece of iron in the bottle, which is 8 cm in length and 15 cm in width and 15 cm in height, how many cm does the water surface rise when the iron is placed vertically in the water?
- 2. In a cylindrical bottle with a bottom radius of 10 cm, the water depth is 8 cm. To put a piece of iron in the bottle, which is 8 cm in length and 15 cm in width and 15 cm in height, how many cm does the water surface rise when the iron is placed vertically in the water?
- 3. In a cylindrical glass tank with a bottom radius of 10 cm and a water depth of 8 cm, an iron block of 8 cm in length and width and 15 cm in height should be placed in the tank 1. How many centimeters will the water surface rise when the iron block is placed horizontally in the water? 2. Put the iron block in the water vertically, how many centimeters will the water rise?
- 4. A cube lead block with an edge length of 8 cm is installed in a cuboid glass tank of 16 cm long, 10 cm wide and 20 cm high, and then some water is put into the tank to completely submerge the cube lead block. When the lead block is taken out of the tank, how many cm will the water in the tank drop?
- 5. A cuboid is 8 cm in height, 1 / 2 in width and 5 / 4 in width. The cuboid is () cm in width, () cm in length, () cm in edge length, () m3 in volume and () cm2 in surface area
- 6. The circumference of the bottom of a cuboid is 36 cm, and the height is 8 cm. What is the total length of the edges of the cuboid?
- 7. The circumference of the bottom of the cuboid is 36 cm and the height is 8 cm. The total length of the edges of the cuboid is () cm
- 8. Use three cuboids that are 3cm long, 2cm wide and 1cm high to form a large cuboid with the smallest surface area. How many square centimeters is the surface area of this cuboid
- 9. There is an empty cuboid container a 40 cm long, 30 cm wide and 20 cm high. There is another cuboid container B 30 cm long, 20 cm wide and 24 cm deep. Now pour part of B's total water to a so that the water in the two containers is the same height. How many cm deep is the container
- 10. The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting it into a cuboid container The length, width and height of a cuboid container are 60cm, 40cm and 30cm respectively. The original height of the water surface is 25cm. After putting in a cuboid iron block, all the iron blocks are submerged in the water, and the height of the water surface rises to 28cm. The length of the iron block is 20cm, the width is 15cm, and how many centimeters are behind the iron block?
- 11. A rectangular food box is 8 cm long, 6 cm wide and 10 cm high. If a circle of brand paper is pasted around the food box, how many square meters is the area of the brand paper at least?
- 12. Cut a cuboid 16 cm long, 8 cm wide and 10 cm high into two cuboids of exactly the same shape and size. What is the maximum and minimum surface area of the cuboid?
- 13. Cut a cube with an edge length of 8 cm into two cuboids of the same shape and size. The volume () and surface area () of each cuboid
- 14. A rectangle shaped plexiglass is 10 cm long, 8 cm wide and 6 cm high. Cut the largest cube on the plexiglass and find the rest
- 15. A cuboid glass jar is 4 decimeters long, 3 decimeters wide and 5 decimeters high. After pouring water, the water depth is 3.5 decimeters, and the poured water is () liters A. 60B. 42C. 52.5
- 16. Pour 18 liters of water into a rectangular glass tank 4 decimeters long, 3 decimeters wide and 2 decimeters high. How many decimeters is the distance between the water surface and the tank mouth?
- 17. There is water in a sealed rectangular glass fiber reinforced plastic. The lengths of the three edges intersecting one vertex of the glass jar are 10 cm, 6 cm and 5 cm respectively. Put the glass jar on the water surface in three different ways. The minimum height of water is 2 cm. What is the maximum height of water? (please draw a sketch and calculate it.)
- 18. In a 6-decimeter-long, 4-decimeter-wide and 3-decimeter-high rectangular glass jar, the water depth is 2 decimeters, The water depth becomes 2. Find the volume of the iron ball
- 19. A 40 cm long, 20 cm wide and 30 cm high cuboid glass jar is 18 cm deep. Now an iron ball is completely immersed in the water, and the water surface rises to 25%
- 20. As shown in Figure 1, the water depth in a closed rectangular glass tank is 3 cm. If the glass tank is placed as shown in Figure 2, how many cm is the water depth inside?