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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
"Yining": let container B pour a part of it to container a, and the water depth of the two containers is n cm. The equation is as follows: (unit name is omitted in the calculation process) 30 × 20 × (24-n) = 40 × 30 × n14400-600 n = 1200 n14400 = 1800nn = 8 (CM). Checking calculation: container a is 40 cm long and 30 cm wide, container B is 30 cm long and 20 cm wide
Pour 480 liters of water into a cuboid container 60 cm long and 40 cm wide. The water surface is 6.5 cm from the container mouth. How high is the container?
480000÷（60x40）+6.5=206.5cm
How to find the range of quadratic function
The image of quadratic function is a parabola,
Y = ax ^ 2 + BX + C (a > 0) the opening of the parabola is upward, and its range is from the vertex ordinate to positive infinity
y=ax^2+bx+c (a
The solution of quadratic equation of one variable: xsquare-7x-18 = 0
x²－7x－18＝0
﹙x－9﹚﹙x＋2﹚＝0
X-9 = 0 or x + 2 = 0
Ψ x = 9 or x = - 2
Factorization. (1-a2) (1-b2) - 4AB
（1-a2）（1-b2）-4ab=1-b2-a2+a2b2-4ab，=1-2ab+a2b2-（a2+b2+2ab），=（ab-1）2-（a+b）2，=（ab-1+a+b）（ab-1-a-b）．
As shown in the figure, go through the center of gravity o of △ ABC (the intersection of the three midlines) and make a parallel line of BC, intersecting AB at D and AC at E. then the area ratio of △ ade to △ ABC is ()
A. 1：2B. 2：3C. 1：3D. 4：9
As shown in the figure, FH ∥ CG intersects AB at h through F, ∵ f is the midpoint of BC, ∥ BH = Hg = 12bg = 12ag, ∵ og ∥ FH, ∥ Ao: AF = Ag: ah = Ag: (Ag + Hg) = 1: (1 + 12) = 2:3, and ∵ de ∥ BC, ∥ ade ∥ ABC, Ao: AF = AE: AC, ∥ s △ ade: s △ ABC = AE2: ac2 = AO2: af2 = 4:9
How many centimeters is an inch in ancient times? One foot, one foot?
Length unit: 1 Li = 15 yin = 150 Zhang 1 yin = 10 Zhang 1 Zhang = 2 steps = 10 1 step = 5 different dynasties, Zhou Dynasty took eight feet as a step, Qin Dynasty took six feet as a step? 1 chi = 10 inch 1 inch = 10 minute 1 minute = 10 centigrade 1 centigrade = 10 millimetre 1 millimetre = 10 silk 1 silk = 10 sudden conversion: 2 li
The foundation of a teaching building is a rectangle, 420 meters long, drawn on a plan, only 6 cm long. Find the scale of this picture
420m = 42000cm
6:42000=1:7000
A: the scale is 1:7000
How to prove that the sum of squares on both sides of a triangle is equal to twice the sum of squares of the middle line on the third side and half of the third side
Using cosine theorem
What is the element of the set a = {square of X + 2x + 1}? If 1 belongs to a, then x is equal to? What is the value of X in a, or the number into which X is equal
This question is not expressed correctly. Please say it again
According to the above statement, the solution should be as follows:
1） Element of set a = {X & # 178; + 2x + 1}?
If X & # 178; + 2x + 1 = (x + 1) & # 178; ≥ 1, then the element of set a = {X & # 178; + 2x + 1} is that x belongs to set {x ≥ 1};
2） If 1 belongs to a, then x is equal to?
Let 1 = x & # 178; + 2x + 1, x = 0 or x = - 2, that is: x = 0 or x = - 2;
RELATED INFORMATIONS
- 1. 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?
- 2. A and B are two cuboid containers. Container a is 40 cm long, 30 cm wide and 24 cm high. Container B is 20 cm long, 20 cm wide and 36 cm deep. Pour the water in container B into container a until the water depth in the two containers is the same. How many mm is the water depth in both containers?
- 3. A. The bottom area ratio of two cylindrical containers B is 4:3. The water depth of container a is 20 cm, and that of container B is 10 cm. Now, the same amount of water is injected into the two containers to make the water depth of the containers equal. At this time, the water depth of container a is 20 cm, and that of container B is 10 cm______ Cm
- 4. My mother put some potatoes in a cylindrical container with a bottom area of 40 square centimeters to clean. At this time, the water depth in the container was 30 cm. After taking out the potatoes, the water dropped by 3 cm. What was the volume of these potatoes______ Cubic centimeter
- 5. In a rectangular container 20 decimeters long and 15 decimeters wide, there is water 20 decimeters deep. Now a cube iron block is sunk in the water, and the water surface rises 09 decimeters. What's the volume of this cube iron? 2. There are three cube iron blocks, their surface areas are 24 square centimeters, 54 square centimeters and 294 square centimeters respectively. Now dissolve the three iron blocks into a big cube, and find the area of the big cube
- 6. In a cuboid water tank of 15 decimeters long and 12 decimeters wide, there is 10 decimeters deep water. If a square iron block with 2 decimeters long edge is sunk in the water, then How high is the water in the tank now?
- 7. In a square water tank with 20 cm edge length (measured from the inside) filled with water, there is a 16 cm long, 10 cm wide rectangular iron block When the iron is taken out, the water in the water tank drops by 2cm. What is the height of the iron?
- 8. In a square water tank full of water with 20 cm long edges, there is a rectangular iron block immersed in water, which is 10 cm long and 8 cm wide. When the iron block is taken out, the water level drops by 2 cm. What is the height of this rectangular iron block?
- 9. In a cuboid basin with a length of CM, a width of CM, and a depth of CM, the water depth is 20 cm. If you put a cube stone with an edge length of 10 cm in the basin, it will be very difficult How many centimeters will basin reed water go up? It is 50 cm long 40 cm wide 30 cm deep
- 10. The edge of a cube glass container is 2 decimeters long. Pour 5.5 liters of water into the container, and then put a stone into the water. At this time, the water depth in the container is 15 cm What's the volume of stone in cubic centimeter
- 11. 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
- 12. 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
- 13. 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?
- 14. 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
- 15. 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?
- 16. 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?
- 17. 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?
- 18. 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?
- 19. 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?
- 20. 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?