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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?
Water depth = 18 △ 4 △ 3 = 1.5 (decimeter)
So the distance from the cylinder port = 2-1.5 = 0.5 (decimeter)
A cuboid glass jar is 4 decimeters long and 3 decimeters wide. After pouring 18 liters of water into it, how deep is the water in the glass jar? It's so urgent The answer is The answer is QAQ!
1.5 decimeters
Calculate the determinant of order n: X A.A - a x A.A - A - a X.A - A - A - a.x
Specific steps thank you, the best handwriting
It's very simple. First add all the other lines to the first line, and the first line becomes x + (n-1) a
When it is mentioned, it becomes that the first row is all 1, and then all other columns subtract the first column,
become
1 0 0 .0 0
a x-a 0 .0 0
a 0 x-a.0 0
.
And then we have [x + (n-1) a] ^ n * (x-a) ^ (n-1)
(people's Education Press) Grade 8 Volume 1 mathematics book p27 question 9
(PEP) Grade 8 Volume 1 mathematics book p27 question 9 thank you
Let the angles of ∠ EBA and ∠ ECA be 1 and 2, and ∠ DCA be 3. Because ∠ 1 + 2 = 90, ∠ 3 + 2 = 90, so ∠ 1 = 3, the triangle BEC is equal to the triangle CDA [AAS] be = EC be = ad = 2.5 DC = EC de = 2.5-1.7 = 0.8, and because be = DC, be = DC = 0.8
The following is a group of numbers arranged in the shape of a "tower": in this group, what is the ninth number in line 2009?
-1
-2 3
-4 5 -6
-7 8 -9 10
.
Line I has I numbers
So the first line of 2008 is (1 + 2008) * 2008 / 2 = 2017036
The odd number of each line is negative
So the ninth line in 2009 is - 2017045
What are the multiples of 5 within 100
5、10、15、20、25、30、35、40、45、50、55、60、65、70、75、80、85、90、95、100
There are two cuboid and cube containers with partial water. The water depth in container a is 20cm, and that in container B is 30cm. To make the water depth of container a and container B the same, how many liters of water is needed from container B to container a? Container a is 20cm long and 20cm wide, and container B is 40cm long and 40cm wide
The volume of water in a is 20 * 20 * 20 = 8000ml
The volume of reclaimed water in B is 40 * 40 * 30 = 48000ml
Set the amount of water to be given to XML:
（8000+x）：（20*20）=（48000-x）：（40*40）
20x=192000-128000
20x=64000
x=3200
3200ml=3.2L
A: 3.2 liters of water is required from container B to container a
There are 12 red, yellow, blue and white balls of the same size in the box. If you want to find out, there must be 2 balls of the same color
There are 12 red, yellow, blue and white balls of the same size in the box. If you want to feel out two balls of the same color, you must feel out at least () balls. If you want to feel out two pairs of balls of the same color, you must feel out at least () balls
5,17
The sum of negative 2 / 11 equals negative 1 / 3. What is the number?
Let this number be x, then
x+(-2/11)=-1/3
x-2/11=-1/3
x=-1/3+2/11
x=-5/33
The edge of a cube container is 5 decimeters long. The container contains water. Put a piece of iron into the water, and the water surface rises by 5 cm. What is the volume of the iron?
5 decimeter = 50 cm 50 × 50 × 5 = 2500 × 5 = 12500 (CC) a: the volume of iron is 12500 CC
RELATED INFORMATIONS
- 1. 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
- 2. 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
- 3. 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
- 4. 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?
- 5. 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?
- 6. 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?
- 7. 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?
- 8. 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?
- 9. 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?
- 10. 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?
- 11. 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.)
- 12. 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
- 13. 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%
- 14. 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?
- 15. When a rectangular iron block with a bottom area of 4 square centimeter is put into a glass container with a bottom area of 20 square centimeter, the water in the container rises by 1 centimeter Ask for the height of the iron
- 16. A cuboid shaped glass container, 40 cm long, 30 cm wide and 50 cm high, is waterproof and 3 decimeters high. Now there is a piece of iron in it, which is completely immersed in water, and the water level is 35 cm high. How many kg of iron is put in it (7.8 kg of iron per cubic decimeter)
- 17. A cuboid glass jar is 40cm in length, 20cm in width and 30cm in height. The water depth is 18cm. Now, an iron ball is completely immersed in the water, and the water surface rises to 25cm to calculate the volume of the iron ball
- 18. A sealed cuboid glass can, 30cm long, 18cm wide and 12cm high. When it is square, the water depth inside is 9cm. When it is placed on the side, what is the water depth?
- 19. A cuboid glass container with a bottom area of 96 square centimeters and a height of 10 centimeters contains 5 centimeters of water. Now, an iron bead is completely immersed in water In the above, the water level rises by 2 cm. What's the volume of this iron bead? At least a few of these iron beads must be placed before the water overflows the glass container?
- 20. A cylindrical container a with a height of 8 cm and a volume of 50 ml is filled with water. Now put a 16 cm long cylinder B vertically so that the bottom of B is in line with a When B is picked up from a, the height of water in a is 6cm, and the volume of cylinder B is calculated