A cuboid, 2 decimeters long, cross-section is 4 cm square. How many square meters of cardboard do you need to make 2500? Fast

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• 1. Solving equations x-y=1 2xy=2
• 2. 1. A cylinder and a cone are of equal height and equal base. The sum of their volumes is 12 cubic decimeters. The volume of the cylinder is () cubic decimeters, and that of the cone is () cubic decimeters 2. A cylindrical bucket without cover, with a bottom diameter of 6 decimeters and a height of 6 decimeters. The bucket should be made of at least () iron sheet. If each cubic decimeter weighs 1 kg, the bucket can hold at most () kg of water
• 3. There are two people, a and B. A walks 65 meters per minute and B 55 meters per minute. After B walks for six minutes, a chases B from behind. How many minutes can a chase B 40 meters away? First floor, I can't solve this equation
• 4. 5x-2x=1 6x+y=8 linear equation in two unknowns Solving equations by adding and subtracting
• 5. A classroom is 10 meters long, 8 meters wide and 4 meters high. It is necessary to paint the surrounding and roof walls of the classroom. The area of the classroom is 41.6 square meters except the doors, windows and blackboards. On average, 0.32 kg of lime is used per square meter. How many kg of lime is needed?
• 6. 1*1/2=?
• 7. Math problem, very simple There are 36 large and small steel balls in a box. The ratio of the number of large and small steel balls is 1:8. How many large steel balls are there in the box? How many small steel balls are there? For a triangle, the ratio of the degrees of the three angles is 1:3:2. What is the largest angle in the triangle? That's right. Bonus points.
• 8. Given that the cube root of 6.8 = 4.098, the cube root of 6.88 = 1.902, then the cube root of 6880 =? (please explain the reason) If two vertices of a triangle have been determined (that is, they cannot be moved), and the third vertex can be moved, will the degrees of the three angles change? (the angle code composed of two movable edges is a, and the others are B and C) Given the points a (a, 3), B (- 4, b), AB parallel to the X axis, find the values of a and B (please explain the reason)
• 9. Some very simple math problems are as follows (fill in with fraction, column: 3 / 4 is 3 / 4) 1, 0.57 + 0.3 = () 2, 0.57 △ 0.3 = () 3, 0.57-0.3 = () 4, 0.57 × 0.3 = () (fill in with the simplest fraction) 5, 120 cm = () M 6, 15:00 on the first day = () day 7, 120 ha = () km2 (fill in the appropriate integer) 8, () 15 = 15 △ 3 / () = () / 60 = 60 / () = 0.6 Fill in questions 1 to 4 with the simplest score
• 10. Pro help to give less than 30 non carry addition and subtraction 20 questions
• 11. The sum of three consecutive odd numbers is 33, the largest of which is () When you answer the question, write down the number one,
• 12. In the triangle ABC, a.b.c. are the opposite sides of a, B and C. If vector AB multiplies vector AC = vector Ba multiplies vector BC = 1 To prove a = B to find C side length, the answer should be detailed It's easy for me to understand
• 13. The relationship between the daily water storage capacity of crops in a test field and the growth time is y (kg). The water demand of these crops on the 10th and 30th day is 2000kg and 3000kg respectively. The daily water demand on the 40th day is 100kg higher than that on the previous day When x ≤ 40 and The function of X ≥ 40
• 14. 4 square meters = () square decimeters 0.4 square meter = () square decimeter 4 square decimeters = () square meters 3 ha = () m2 500 ha = () km2 0.8 square decimeter = () square centimeter 0.8 square decimeter = () square centimeter
• 15. 1.6 square kilometers 60 hectares 6000 square meters 60000 square decimeters 2.3:40, 3.2:190, 200
• 16. The second power of (X-2) = 16 to find x The third power of (1-x) = - 0.027 20 / 7 + 3 times root sign 2-2 / 2 Pai (3.14159) accurate to 0.1 If the absolute value of 2a-3 and the root B-2 are opposite to each other, find the value of the cubic power-4a of B Given y = radical X-2 + radical 2-x + 4, find the value of Y power of X It is known that the square root of X is 2A + 3 and 1-3a, and the cube root of Y is a. find the value of X + y Given that M satisfies the quadratic power of 16m - 25 = 0, find the square root of 4m + 5
• 17. 1. The route from city a to city B is 1200 km long. It takes 2 hours and 30 minutes for an aircraft to fly from city a downwind to city B, and 3 hours and 20 minutes to fly from city B upwind to city A? 2. A unit marches for 4 hours on the first day and 5 hours on the second day, with a total of 98km on the two days, and 2km less on the first day than on the second day. What is the average speed of March on the first day and the second day? 3. Each tin sheet can be used to make 25 tins or 40 bottom tins. One tin body and two bottom tins form a tin. Now there are 36 tins. How many tin bodies and bottom tins can make the body and bottom of the tin just match?
• 18. 1、 Add, subtract, multiply, divide or sign () 4()4()4()4=5 4()4()4()4=48 2、 () 6 () x () = 4 () () 2 3、 Find the rules and fill in the numbers 2.6.18.54（）486.1458 4、 The sum of divisor, divisor, quotient and remainder is 100. Given that quotient is 12, remainder is 5, what is the divisor
• 19. Given that the solution of the system of equations {ax + 3Y = (A-1) / 2,3x-2y = 10 is also the solution of equation 9x + 4Y = 40, the value of a is obtained
• 20. The speed of doing math problems is very slow, how to do it? The ability of mental arithmetic is very poor, even the addition and subtraction of less than 10 digits have to be tangled