![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Find the rule: 2, - 4.6, - 8.10, 12.14, - 16, what are the 99th and 100th numbers? Explain why
198,-200
The nth number is (- 1) ^ (n + 1) * 2n
RELATED INFORMATIONS
- 1. Find the law of Mathematics (2,3), (10,6), (20,11), (9,)
- 2. Observe the following figures and their corresponding formulas. According to the rule you found, use n to represent 1 + 8 + 16 + 24 + +8N (n is a positive integer)______ ．
- 3. What is the result of 1 + 8 + 16 + 24 +. + 8N (n is a positive integer)?
- 4. Observe the following figures and their corresponding formulas. According to the rule you found, use n to represent 1 + 8 + 16 + 24 + +8N (n is a positive integer)______ ．
- 5. 1 + 8 = 3, 1 + 8 + 16 + 5, 1 + 8 + 16 + 24 = 7, 1 + 8 + 16 + 24 + ··········· + 8N (n is a positive integer)
- 6. As shown in the figure, observe the figure and its corresponding formula, and calculate 1 + 8 + 16 + 24 + according to the rule you found +The result of 8N (n is a positive integer) is______ ．
- 7. According to the rule you found, the result of calculating 1 + 8 + 16 + 24 +. + 8N (n is a positive integer) is (expressed in an algebraic expression containing n)
- 8. As shown in the figure, observe the figure and its corresponding formula, and calculate 1 + 8 + 16 + 24 + according to the rule you found +The result of 8N (n is a positive integer) is______ ．
- 9. Observe the following figures and their corresponding formulas, and calculate 1 + 8 + 16 + 24 + according to the rule you found +The result of 8N (n is a positive integer) is () A. （2n+1）2B. （2n-1）2C. （n+2）2D. n2
- 10. Find the rule 0,1,3,12, Urgent! Process!
- 11. Find the rule 1,4,16,36,64100, ()
- 12. The rules of 100, 81, 49, 36, (), 16, () are as follows
- 13. 1. Fill in the blanks according to the rules, （2）1,8,27,（）125,（） 2 (1) find the unknown X 5 / 3 x + 1 / 10 x = 7 / 5 5x-2.1 small X4 = 9.6 (4-1.6)x=36 2X divided by 5 = 15
- 14. Fill in the blanks: 1, 81, 64, 49, (), 25, (), () 2, 2, 3, 5, 8, (), (), 34
- 15. The solution equation: 2.1 △ x = 0.3, 7.2-x = 4.3, x-0.84x = 0.8, 30 × (x △ 4) = 60, 84 + x = 10.2
- 16. 3: How to solve the equation? 30% × 2.5 + 3 / 10 × 3.7 + 0.3 × 3.7 is simple and convenient
- 17. (x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6)
- 18. X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05 X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05
- 19. 8 / x = 0.36 / 0.6
- 20. (5-x)*3=(7-x)*2 x*（1-0.2）=145-x+8 x*6+x（1+0.1）*5=1518 9+x =(36+x)*0.4