Who told me all the rate and the area formula of the figure Come on, I'll hand it in tomorrow!

Length: kilometer (1000) meter (10) decimeter (10) centimeter (10) millimeter area: square kilometer (1000000) square meter (100) square decimeter (100) square centimeter (100) square millimeter volume: cubic meter (1000) cubic decimeter (1000) cubic centimeter (1000) cubic millimeter plot: Square

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1. The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. How many pieces of cement bricks with a side length of 4 decimeters There must be a formula The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. If we use cement bricks with a side length of 4 decimeters instead
2. The sidewalk is 150 meters long and 50 decimeters wide. It needs to be paved with 30 square decimeters of cement bricks. How many cement bricks do you need to fill this sidewalk?
3. A sidewalk is 40 meters long and 8 meters wide. It is paved with cement bricks with an area of 25 square decimeters. It needs more cement bricks
4. A pile of coal pile into a cone, the bottom circumference is 25.12 meters, the height is 1.2 meters? I calculated the answer, and students, but not the same
5. A cone-shaped pile of fertilizer with a circumference of 62.8 meters and 5 meters at the bottom. If 20 cubic meters of fertilizer is applied to each hectare of land, how many hectares of fertilizer can be applied
6. The circumference of the bottom surface of a cone-shaped fertilizer pile is 12.56 meters, and the height is 1.8 meters How many hectares of land can this pile of fertilizer apply? O (∩) O thank you, If the fertilizer is 20 cubic meters per hectare
7. The circumference of the bottom surface of a cone-shaped rice pile is 12.56 meters, the height is 3 meters, and each cubic meter of rice weighs 500 kg, Write the formula clearly, I can't understand it!
8. 140 square decimeters = () square meters 96 seconds = () minutes 38 months = () years emergency 45 min = () H 76 cm = () m 125 ml = () l It's all expressed in fractions
9. There are two long ropes of 18 meters and 24 meters respectively. They should be cut into small sections of the same length. What is the maximum length of each section? How many segments can be cut?
10. There are two sticks, which are 12 cm and 44 cm long respectively. They should be cut into sticks of the same length. No one is allowed to leave any sticks. How long can each stick be? How many sticks are cut into?
11. If the length of a rectangle is increased by 6 meters or the width by 4 meters, the area will be increased by 48 square meters. What is the original area?
12. What is the formula for finding the area of a regular polygon?
13. The perimeter of the two rectangles A and B is equal, and the total area is 165 square centimeters. The length width ratio of rectangle A is 5:3, and that of rectangle B is 7:5, What is the area of a rectangle?
14. There are two experimental fields a and B. field a is 40 meters long and 30 meters wide; field B is 50 meters long and 16 meters wide. 360 kg of chemical fertilizer should be distributed according to the area. How much chemical fertilizer should each field be
15. If the length of a rectangular field is increased by 8 meters or the width by 5 meters, the area will be increased by 80 square meters
16. 0.034 × 0.5 × 0.6 = how much (simple calculation)
17. Simple calculation of 4.73 times 0.29
18. Simple operation of 102 × 73
19. Simple calculation of 102 * 46
20. Simple calculation of 3.5 × 98 + 35 × 0.2