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With a 80 cm long, 40 cm wide rectangular sheet iron, cut together into a 10 cm deep container without cover, which can be welded What's your volume? Write down all the spelling methods and answers you come up with
It is formed by bending after removing the square with side length of 10cm at four corners
Volume: 60 * 20 * 10 = 12000 (cm3)
Use iron sheet to make a cuboid oil tank without cover. It's 100cm long, 80cm wide and 40cm high. It needs iron to make this oil tank
How many square meters of iron sheet
100cm = 1m, 80cm = 0.8m, 40cm = 0.4m
Iron sheet: 1 × 0.8 + (1 × 0.4 + 0.8 × 0.4) × 2 = 2.24 square meters
In the acute triangle ABC, ab = 15, BC = 14, s triangle ABC = 84
In RT △ abd, BD ^ 2 = AB ^ 2-ad ^ 2, BD = 9, so CD = bc-bd = 14-9 = 5, then Tanc = ad / CD = 12 / 5
Eating vegetables and fruit is good for your health?
The subject here is not vegetables, but eating vegetables and fruit! The heart word is eating, which is a gerund. Where gerund is the subject, the predicate is singular
A right triangle knows that the bottom is 12 meters and the height is 6 meters. How to calculate the length of the hypotenuse?
12²+6²=144+36=180
Hypotenuse = radical 180 = 6 times radical 5
Square of a + square of B = square of C
Square of two right angle sides = hypotenuse
I'm a scholar, please give me some advice
Right! Hypotenuse = root 180 = 6 times root 5
Left (antonym) fifth (cardinal) different (antonym) postcard (plural) Dictionary (plural) bus (plural)
Left (antonym) ---- right
Fifth (cardinal) ---- five
Different (antonym) ---- same
Postcards (plural)
Dictionaries (plural)
Bus (plural)
C / COSC = A / cosa how to prove a = C with cosine theorem
∵ COSC = (a ^ 2 + B ^ 2-C ^ 2) / (2Ab), cosa = (b ^ 2 + C ^ 2-A ^ 2) / (2BC), and C / COSC = A / cosa, ∵ C / [(a ^ 2 + B ^ 2-C ^ 2) / (2Ab)] = A / [(b ^ 2 + C ^ 2-A ^ 2) / (2BC)], ∵ ABC / (a ^ 2 + B ^ 2-C ^ 2) = ABC / (b ^ 2 + C ^ 2-A ^ 2)
If the auxiliary verb in English uses the past tense, do verbs still need to be used?
Different auxiliary verbs have different forms, such as
The auxiliary verb did in the past tense is followed by the original form;
The auxiliary verb was / were followed by - ing in the past continuous
The past perfect auxiliary verb had is followed by the past participle
How to understand the universality of the law of negation of negation
”It can only be formed through the process of the unity of opposites, that is: Ken's development of the unity of opposites is a process, people's recognition stage (including the negative unity of opposites), the negative stage (including a clear understanding, but the existence of the unity of opposites itself is a positive unity of opposites), and the negative stage of negation (sublating some comrades' understanding is not so clear, The negation of negation only shows that the unity of opposites is a static phase between the two sides of opposites. Now the unity of opposites in the third stage is only related to the first two stages, such as up and down, left and right, front and back, positive and negative, etc. Although the paragraph is the unity of opposites, it does not show the negation of negation, It seems that if the opposites are arranged together, they will form a contradiction. In other words, the negation of negation is the unity of opposites, and the unity of opposites is understood as a process. I don't know that the unity of two sides of contradiction is not necessarily the negation process of negation. Therefore, it is a moving process to connect and unify
Add plural or singular after none? Give an example
When "None" is used as the subject, if it is used with "of" to refer to an uncountable noun, the predicate verb should be in the singular; when it refers to a countable noun, the predicate verb can be in the singular or plural
None of them has / have seen me before.
None of this money belongs to me.
RELATED INFORMATIONS
- 1. A 16 cm long and 8 cm wide rectangular sheet iron, can you cut it into five pieces and weld it into a rectangular container with a square bottom? (no waste) draw a sketch and figure out the volume of the container?
- 2. A 16 cm long and 8 cm wide rectangular sheet iron, can you cut it into five pieces and weld it into a rectangular container with a square bottom? (no waste) draw a sketch and figure out the volume of the container?
- 3. A 24 cm long rectangular iron sheet is welded into a box without a cover by subtracting a small square with a side length of 3 cm from its four corners. The volume of the box is 486 cubic centimeters That's a good answer Take a 24 cm long rectangular iron sheet, subtract the small square with side length of 3 cm from the four corners, and then weld it into a box without cover. The volume of the box is 486 cubic cm. Calculate the volume of the original rectangle
- 4. A 24 cm long rectangular sheet iron is cut off from the four corners and welded into a box. The volume of the box is 486 cubic centimeters, and the original width of the sheet iron is calculated
- 5. A 24 cm long and 8 cm wide rectangular sheet iron, can you cut it into 5 pieces and weld it into a cuboid container with a cube at the bottom? Draw a picture of the scissors. What's the volume of the container?
- 6. A cuboid uncovered iron water tank is 0.8 meters long, 0.65 meters wide and 0.6 meters high. How many square meters of iron is needed to make this water tank? If each liter of water weighs 1 kg, how many kg of water can the tank hold at most? (the thickness of iron sheet is ignored)
- 7. Master Li wants to weld a rectangular iron box without cover with iron sheet (as shown in the picture). How many square decimeters of iron sheet is needed to make this iron box? How many cubic decimeters is the volume of the iron box?
- 8. Use a 6-decimeter-long, 4-decimeter-wide rectangular sheet iron to make a 8-centimeter-deep cuboid uncovered sheet iron box (the welding joint is ignored). What is the volume of this sheet iron box? A book is 21 cm in length, 15 cm in width and 0.8 cm in thickness. If you give a book cover with 2 cm edges on the top, bottom, left and right sides, how many square centimeters of paper does it take to wrap the book?
- 9. A cuboid iron box without a cover, 18 cm long, 15 cm wide and 10 cm high. How much iron sheet does it need to make this iron box
- 10. There is a rectangular sheet of iron 40 cm in length and 30 cm in width. Cut out an equal small square at its four corners to make a cuboid uncovered sheet iron box 5 cm in depth (the thickness of welding joint is not included). What is the volume of the box?
- 11. A 48 cm long and 24 cm wide rectangular sheet iron is used to make a 6 cm deep uncovered cuboid container, and the thickness of welding joint and sheet iron is not considered How many welding methods can you find? How to weld the largest volume There are several welding methods, the length, width and height of each is OK
- 12. Make a 5cm deep uncovered rectangular iron box with a 50cm long and 20cm wide rectangular iron sheet (the thickness of iron sheet at welding joint is not included) Q: what is the maximum volume of this rectangular iron box? Wrong. It's a rectangular iron sheet 50 cm long and 40 cm wide, making a 10 cm deep uncovered rectangular iron box
- 13. In a 15 decimeter long and 12 decimeter wide rectangular water tank, there is 10 decimeter deep water. If you sink into a 60 cm square iron block in the water What is the depth of water in the tank
- 14. In a 40 cm long, 25 cm wide, 20 cm high cuboid water tank into 15 cm deep water How many centimeters will the water surface rise when immersed in water?
- 15. In a cuboid water tank 15 decimeters long and 12 decimeters wide, there is water 10 decimeters deep. Now a cube sinks into the water, and the water The surface rises to 11. Find the volume of the cube
- 16. A cuboid water tank is immersed in a cube iron block with an edge length of 10 cm. The length of the water tank is 40 cm, the width is 30 cm, and the water depth is 25 cm. When the iron block is taken out, what is the distance between the water surface and the bottom of the tank?
- 17. How many centimeters can the water surface rise to when a cuboid tank with a length of 50 cm, a width of 40 cm and a height of 30 cm is filled with water 20 cm deep and a cube with a length of 20 cm is immersed in water?
- 18. A rectangular glass container, 8 decimeters wide, now 45 cm deep, when a square iron block with an edge length of 4 decimeters is placed in the water After that, will the water overflow? If so, how many liters?
- 19. In a 12 cm long, 9 cm wide, 8 cm high cuboid container filled with water, the water soaked with a 6 cm long square iron block, when the iron block from the water After taking out, what will happen and what will the result be
- 20. 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