![](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>)
Observe the following column of numbers: 1 / 2, - 1 / 6,1 / 12, - 1 / 20. Please find out the rule and fill in the blanks according to the rule. The ninth number is ()
1/(9×10）
That is, the ninth number is (1 / 90)
RELATED INFORMATIONS
- 1. Look at the following sequence of numbers, one half minus one sixth minus one twelfth minus one twentieth... And so on, the ninth number is（
- 2. Look at the following column: half, one sixth, one twelfth, one twentieth And so on, what are the ninth and fourteenth numbers? Why?
- 3. The number of columns arranged according to a certain rule is negative half, one sixth, one twelfth, one twentieth and one thirtieth According to this rule, the 99th number is ()
- 4. One half, one sixth, one twelfth, one twentieth, one thirtieth The 60th number is ()
- 5. Observe the rules and fill in the blanks: 1 and 1 / 2, 2 and 1 / 4, 3 and 1 / 8 The nth number is（
- 6. There is a group of numbers: 1, 2, 5, 10, 17, 26,..., please observe the law of the composition of this group of numbers, and use the law you found to determine the eighth number as____ The nth number is ()
- 7. What are the rules of 1,2,5,10,17,26 1, 2, 5, 10, 17, 26. What's the rule
- 8. There is a column of numbers 7, O, 2,5,3,7,0,2,5,3. What is the 19th number and the 28th number
- 9. There is a question, when a = 19 / 17, B = -0.198 Find the fourth power of the algebraic formula 41a - the third power of 7a, the second power of B - the second power of 5A, the fourth power of B - the fourth power of 29a + the second power of 4A, the second power of B + the third power of 5A, the second power of B - the fourth power of 12a + the second power of B, the second power of a + the second power of 2B, the third power of A. Wang Meng points out that the condition a = 19 / 17 (17 / 19), B = -0.198 given in the title is redundant. Do you think his statement is reasonable, why? 2. It is known that the quadratic power of p-pq = 1 and the quadratic power of pq-3q = 2 Finding the quadratic power of P + 3pq-3q The first question is more troublesome, please take paper to help me calculate
- 10. Number of columns 13.1, 15.1, 17.1, 19.1 387.1, the average of this column is ()
- 11. 1. Observe the following column number: - -. 2, 6, 12, 20. Please find out the rule of arrangement and fill in according to this rule 1 1 1 1 Look at the following number of columns: ---- 2 ， 6 ， 12 ， 20 Please find out the rule of arrangement and fill in the blanks according to the rule (1) The ninth number is___ The fourteenth number is. (2) If n is an integer greater than 1, write the nth number according to the above arrangement
- 12. Observe the following column: 1 / 2, - 1 / 6,1 / 12, - 1 / 20. Please find out the rule of arrangement and fill in the blanks according to the rule If n is an integer greater than 1, write the nth number according to the above arrangement
- 13. A series of numbers arranged regularly are: 2, 3, 10, 15, 26, 35 According to this rule, what is the seventh number in this column?
- 14. There is a column of numbers, which are arranged into 1, - 2,4, - 8,16, - 32 according to a certain rule, in which the appropriate number of three adjacent numbers is - 96, what are the three numbers?
- 15. The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number?
- 16. The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number?
- 17. The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number?
- 18. The number of columns in regular order: 2, - 4, 8, - 16, 32, - 64 The sum of some four adjacent numbers is - 640. What is the difference between the largest number and the smallest number?
- 19. 1. 4 times the sum of a and 9 () 2. 30 less than 5 times of X () 3. The sum of X and Y divided by their difference () 4. The sum of a and its reciprocal () 5. The square of the sum of M and n ()
- 20. There is a group of numbers: 1 * 2,2 * 3,3 * 4, ··········································································