China's mountainous area accounts for about a few percent of the total land area emergency

The mountainous area accounts for 33.3% of the total land area, the hilly area accounts for 9.9% of the total land area, and the plateau accounts for 26% of the total land area

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1. What percentage of the total area of Tibet
2. How to calculate the floor area of a house
3. How to calculate the room area How many square meters is a room 2.1 meters long and 2.1 meters wide?
4. On the conversion of civil housing use area and construction area! The usable area is 21.5 square meters. How many square meters is the building area? How to calculate? Please don't paste a lot of I just want an answer. The floor area of my small apartment is 21.5 square meters, single balcony and side guard. What's the building area? The house was built in 1990 (brick concrete structure)!
5. There is a 1.4 meters long, 1.2 meters wide, 0.8 meters high rectangular carton on the ground. How many square meters is the minimum floor area and how many square meters is the maximum floor area
6. Mingmingjia has two cartons of the same size (as shown in the picture). How to put these two cartons? What is the minimum floor area? How many square meters is the floor area? The cartons are 1.2 meters long It is 0.6m wide and 0.5m high
7. 1. A cuboid, 4 meters long and 3 meters wide, covers an area of () square meters at most and () square meters at least 1. A cuboid, 4 meters long and 3 meters wide, covers an area of () square meters at most and () square meters at least. 2. The surface area of a cuboid is 24 square decimeters, and it is divided into two identical cuboids, each with a surface area of () square decimeters. 3. There is a glass fish tank without a cover, 20 cm long, 15 cm wide and 10 cm high, Do such a pair of fish tank need () square decimeter of glass, a total of water () liter
8. A rectangular pool is 20 meters long, 10 meters wide and 2 meters deep. How many square meters does the pool cover
9. A bathroom is 2.4 meters long and 1.8 meters wide. How many square meters does it cover?
10. The height of a cylindrical carton is 15cm. If the height is reduced by 2cm, the surface area will be reduced by 188.4cm I learned 188.4 △ 2 = 94.2 (CM) 94.2 △ 3.14 △ 2 = 15 (CM) 15 × 15 × 3.14 = 706.5 (square cm) 94.2 × 15 = 1413 (square cm) 706.5 × 2 + 1413 = 2826 (square cm)
11. What's the area of the ocean on earth?
12. The rose planting area in the botanical garden accounts for 2 / 9 of the total area, and the rose accounts for 1 / 3 of the total area. Which kind of flower has the largest planting area? How much is it?
13. The side length of square glass is 8 decimeters. Now there are 9 pieces of such glass. How many square decimeters do they have in total? How to explain to children
14. Cut 6 square meters of glass into 9 pieces, each piece is () square meters, three pieces account for ()
15. Don't go into too much detail, just say that the ocean accounts for a few parts of the total area of the earth
16. What's the proportion of ocean area to the total area of the earth? What's the proportion of land area to the total area of the earth? (what's the proportion!)
17. Divide the rectangle in the figure below into six parts. What's the area of a in the total area? What's the area of a in the sum of the areas of B. C? B. The sum of the areas of C is a fraction of the sum of the areas of d.e.f. (remark: there are 6 copies in total, and a.b.c.d.e.f takes one copy each
18. There is a rectangular vegetable field with an area of 5 square meters, which is divided into 6 pieces in the draw. How many parts of the total area does each piece of land occupy? How many square meters is each piece of land?
19. Divide a 3-meter-long and 2-meter-wide rectangular sheet iron into 9 parts on average. How many parts of the sheet iron does each share?
20. One is a 15 meter long and 12 meter wide rectangular sheet iron, which is divided into nine parts on average. How many square meters is each? How many parts of this sheet iron is each?