The sum of the squares of a number and 4 is equal to the sum of the squares of the number and 2

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• 1. The square of 19 is equal to the sum or difference of the squares of which two numbers?
• 2. 1997 is equal to the sum of the squares of which two numbers
• 3. The sum of a number and 3 is the sum of the squares of a number and 2
• 4. Three times of a certain number is two times larger than half of it. If a certain number is y, then the equation is___
• 5. 3 / 4 of a certain number is smaller than 1 / 2 of it
• 6. The product of the opposite number of a certain number and 2 is 3 times smaller than that of it No answer, pig! Answer, God!
• 7. Let f (x) = x ^ 2 + X, when x belongs to [n, N + 1], (n belongs to positive integer), the number of all integer values of F (x) is g (n) Let an = (2n ^ 3 + 3N ^ 2) / g (n), n be a positive integer, and then find s (n)
• 8. There is a figure composed of a cube. The first level is one, the second level is three, the third level is five, and the fourth level is seven. How many N levels are there in the fifth level
• 9. Looking for a rule, there is a pile of exactly the same cubes. Counting from top to bottom, the first layer is 1, the second layer is 3, and the third layer is 10 , In the corner there was a pile of identical cube blocks Counting from top to bottom, the first layer is 1, the second layer is 3, and the third layer is 10 When it's five stories, it's a total of 35 blocks Are there any rules?
• 10. A number of square pendulum figures with equal edge length, in the order: from top to bottom, 1 in the first layer, 3 in the second layer, 6 in the third layer, and 4 in the fourth layer A number of square pendulum figures with equal edge length, in the order of top to bottom One in the first layer, three in the second layer, six in the third layer, ten in the fourth layer, and fifteen in the fifth layer. What is the number of cubes in the nth layer? We stipulate that "△" is a new operational symbol. We know that 5 △ 3 = 5 + 6 + 7; 6 △ 2 = 6 + 7, 2 △ 4 = 2 + 3 + 4 + 5, then 3 △ 5= What's after the equal sign? Write out the process and I will score!
• 11. Sum of squares of three consecutive nature books____ Give a reason for the square of a natural number!
• 12. If the sum of squares of one set of opposite sides of a quadrilateral is equal to the sum of squares of another set of opposite sides, If the sum of squares of one set of opposite sides of a quadrilateral is equal to the sum of squares of another set of opposite sides, what is the relationship between its diagonals? Why?
• 13. Cube of 1 + cube of 2 + +Cube of n=
• 14. 1.1 + 2 + 2 square + 2 cube + +2 =? 2. How many sets of integer solutions are there for the equation (square of X - square of y = 1991)? 3. (2x square + X + 1) cube = 6 times of a0x + 5 times of a1x + 4 times of a2x + 3 times of a3x + 2 times of a4x + a5x + A6 Find A0 + A1 + A2 + a3 + A4 + A5 + A6 =? I hope you will understand me
• 15. A round pool can hold 300 cubic meters of water. The height is 4.5 meters. How big is the diameter? Thank you
• 16. A round pool of 10 cubic meters in diameter It's a cylinder
• 17. What is the standard length of a 1000 cubic meter water tank? Is it better to be round or square? What is the wall thickness
• 18. How to build a 50 cubic meter water storage tank? We need a specific plan·
• 19. Make a round pool, 10 meters in diameter and 0.15 meters in height. How to calculate its volume,
• 20. How to calculate the volume formula of a circle? A pool 2 meters high and 2 meters in diameter