1, - 2,3, - 4,5, - 6,7, - 8______

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• 1. 1,-2,3,-4,5,-6,7,-8…… What is the number 2004 and the number 2005?
• 2. -1 / 2,2 / 3, - 3 / 4,4 / 5, - 5 / 6,7 / 8... Conjecture the sum of the nth number and the nth plus one number (n is odd)
• 3. As in 2 / 3 - 3 / 4 4 / 5 - 5 / 6 6 / 7 - 7 / 8, the nth number
• 4. A string number: 5, 10, 17, 26 The nth number is represented by an algebraic expression containing n
• 5. 1,5,9,13,17. Express the nth number with algebraic formula
• 6. 1, - 3,5, - 7... According to this rule, what is the nth number?
• 7. 1, 3, 5, 7, 9. What's the nth number
• 8. 1. - 3.5. - 7.9 according to this rule, how to express the nth number
• 9. The nth number is 2 4 6 8 10 what is the nth number? What is the nth number 14 9 16 25 what is the nth number? 12 / 14 / 18 / 16 what is the nth number What is the nth number of 0 3 8 15 24? What is the nth number of 1 3 6 10 15 What is the number n of 24 8 16 32
• 10. 1 / 3, 1 / 7, 1 / 9... The nth number is
• 11. There are 1 cube in the first layer, 3 cubes in the second layer, and 6 cubes in the third layer How many cubes are there in layer N? Expressed by the formula with n
• 12. The first layer has one cube, the second layer adds two cubes on the basis of the previous layer, and the third layer adds three cubes on the basis of the second layer. How many cubes are there in the N layer There is one cube in the first layer, two cubes in the second layer and three cubes in the third layer. How many cubes are there in the N layer
• 13. 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!
• 14. 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?
• 15. 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
• 16. 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)
• 17. 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!
• 18. 3 / 4 of a certain number is smaller than 1 / 2 of it
• 19. Three times of a certain number is two times larger than half of it. If a certain number is y, then the equation is___
• 20. The sum of a number and 3 is the sum of the squares of a number and 2