______ Liter is 13 less than 12 liter, 8 cubic meter is more than 5 cubic meter______ %．

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• 1. How many cubic meters is 10 meters
• 2. 35% of 2.4 tons is () tons; 120 cubic meters is more than 100 cubic meters (); 20 square meters is less than 25 square meters ()
• 3. The area of a room is 20 square meters, paved with 1 meter long, 1 decimeter wide, 2 cm thick wood floor, at least () cubic meters of wood floor
• 4. How to measure the density of rice grain with density bottle
• 5. Density of rice
• 6. How to change the liter and kilogram
• 7. 3.05 cubic meters = () cubic meters () cubic decimeters 3200ml = () l = () cubic decimeter
• 8. 78.3 cubic decimeter = () cubic meter Be quick
• 9. Solution of cubic equation with one variable I want to ask about the root formula ~ don't copy it from the encyclopedia ~ I don't understand ~ read it! I wonder if the cubic equation can be solved only in some special form? What is the root expressed in terms of the corresponding coefficients?
• 10. I want to know the solution of cubic equation of one variable
• 11. How many cubic meters is one cubic meter? And the relevant formula
• 12. The gravity of a stone is 5N in the air and 2n in the water
• 13. Xiao Jie found a metal block, and he wanted to know its gravity and density. He only had a spring scale with small range in his hand. When he used the spring scale to measure the gravity of the metal block, he found that it had exceeded the maximum range of the spring scale, so he designed the device as shown in the figure to measure. In the figure, OA: OB = 1:3, the metal block was suspended at point a with a string, and the spring scale was used at point B When a vertical upward force is applied, when the OB lever is horizontally stationary, the reading of the spring scale is 1.8n. When water is added to the container and the metal block is immersed in water, the reading of the spring scale is 1.2N, G is 10N / kg? (2) What is the buoyancy of a metal block when it is immersed in water? (3) What is the density of the metal block?
• 14. There is an iron ball with a mass of 32 grams and a volume of 8 cubic centimeters. Is it solid? (the density of iron is 7.8 grams per cubic centimeter.)
• 15. There is a kind of metal with a mass of 81g and a volume of 30 cubic centimeters. Find the density of the metal and judge which metal it is?
• 16. There is a piece of metal with a mass of 386 kg and a volume of 20 cubic centimeters. The density of this metal is () kg / m3
• 17. 3.1 g / cc = how many kg / m3? Such as the title
• 18. Let f (x) satisfy f (x + x ^ - 1) = x ^ 3 + x ^ - 3, then the expression of F (x) is
• 19. It is known that the expression of a function is the square of y = x, and its range is [1,9]. How many such functions are there? Try to write out two of them Set M = {a, B, C}, n = {- 1,0,1}, the mapping f from m to n satisfies the relation f (a) > F (b) > = f (c), then what is the number of mappings? A.1 B.2 C.3 D.4 Given that f (x + 1 under radical) = x + 2 under radical, find f (x)
• 20. Let f (x) = 1-1 / x + x square judge its parity and prove f (1 / x) = - f (x))