![](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>)
The number of a column: 1,3 + 5,7 + 9 + 11,13 + 15 + 19,12 + 23 + 25 + 27 + 29?
1^3=1,2^3=8,3^3=27,4^3=64,…… By analogy, the nth number is n ^ 3
As shown in the figure, if the number of a column is arranged according to the rule in the figure, the numbers that should be filled in the question mark are 1, 1, 2, 3, 4, 6, 9, 19 and?
Twenty-eight
1、1、2、3、4、6、9、13、19、28
The nth number + the (n + 2) number is equal to the N + 3 number (n = 1,2,3,...)
1,1,2,3,4,6,9,13,19…… Find the arrangement rule of this column number
Next comes 28 41 60
The rule of sequence should be as follows: from the fourth (n) number, it is equal to the first number (n-1) in front and the third number (n-3) in front
For example: 3 = 2 + 1 4 = 3 + 1 6 = 4 + 2 19 = 13 + 6, then 9 + 19 = 28 13 + 28 = 41
According to a certain rule, the number of a column is 1 49 16 25. What is the 100th number and why is it equal to this number There is also a question to observe a column number 3 8 15 24 35 48 and so on. What is the 99th number
When n = 100
n^2=10000
One column number, 1 / 2, 1 / 5, 1 / 10, 1 / 17 What's the number in 2008?
Square of 2008 + 1
If there is a column of numbers - 1 / 2, 2 / 5, - 3 / 10, 4 / 17..., then the seventh number is---- Help me, or my mother will hit me
-7/50
Molecules - 1, 2, - 3, 4, - 5, 6, - 7 (odd negative, even positive)
Add 3, 5, 7, 9, 11, 13 to the denominator
The number of columns arranged according to a certain rule is: 1 2，1 3，1 10，1 15，1 26，1 35… The seventh number in this column is () A. 1 Forty-five B. 1 Forty C. 1 Forty-six D. 1 Fifty
Molecular Law: molecule is constant 1;
The rule of denominator: the denominator of the first number is: 12 + 1 = 2,
The denominator of the second number is: 22-1 = 3,
The denominator of the third number is: 32 + 1 = 10,
The denominator of the fourth number is: 42-1 = 15,
The denominator of the fifth number is: 52 + 1 = 26,
The denominator of the sixth number is: 62-1 = 35,
The denominator of the seventh number is: 72 + 1 = 50,
...
The denominator of the odd number is N2 + 1,
The denominator of the even term is n2-1,
So the seventh number is one
50．
Therefore, D
The number of columns arranged according to a certain rule is: 1 2，1 3，1 10，1 15，1 26，1 35… The seventh number in this column is () A. 1 Forty-five B. 1 Forty C. 1 Forty-six D. 1 Fifty
Molecular Law: molecule is constant 1;
The rule of denominator: the denominator of the first number is: 12 + 1 = 2,
The denominator of the second number is: 22-1 = 3,
The denominator of the third number is: 32 + 1 = 10,
The denominator of the fourth number is: 42-1 = 15,
The denominator of the fifth number is: 52 + 1 = 26,
The denominator of the sixth number is: 62-1 = 35,
The denominator of the seventh number is: 72 + 1 = 50,
...
The denominator of the odd number is N2 + 1,
The denominator of the even term is n2-1,
So the seventh number is one
50．
Therefore, D
The number of columns arranged according to a certain rule is: 1 2，1 3，1 10，1 15，1 26，1 35… The seventh number in this column is () A. 1 Forty-five B. 1 Forty C. 1 Forty-six D. 1 Fifty
Molecular Law: molecule is constant 1;
The rule of denominator: the denominator of the first number is: 12 + 1 = 2,
The denominator of the second number is: 22-1 = 3,
The denominator of the third number is: 32 + 1 = 10,
The denominator of the fourth number is: 42-1 = 15,
The denominator of the fifth number is: 52 + 1 = 26,
The denominator of the sixth number is: 62-1 = 35,
The denominator of the seventh number is: 72 + 1 = 50,
...
The denominator of the odd number is N2 + 1,
The denominator of the even term is n2-1,
So the seventh number is one
50．
Therefore, D
The number of a column arranged according to a certain rule is: 1 / 2,1 / 3,1 / 10,1 / 15,1 / 26,1 / 35___
1/50
This problem only needs to look at the denominator
2 = the square of 1 + 1
3 = 2 squared-1
10 = the square of 3 + 1
15 = 4 squared-1
26 = the square of 5 + 1
35 = 6 squared-1
So the next thing is 7 squared + 1 = 50
RELATED INFORMATIONS
- 1. The number of columns arranged according to the regulations is 2, 3, 10, 15, 26 and 35. What is the seventh number? If the answer is right, a reward will be offered!
- 2. Look at the following list: half, one sixth, one twelfth, one twentieth Please find out the rule of arrangement and press here Fill in the blank regularly The fifth number is—— The number in 2011 is——
- 3. -3 / 4, 5 / 7, - 10 / 9, 17 / 13, - 33 / 16 to find the law, what is the number 2012
- 4. In extracurricular activities, four people report the number. A says: 1. B says 2, C says 3, and Ding says 4. In this way, the total number of people reported is more than money. Ask 34 who reported it. 71 who reported it
- 5. 55 students from class 5 (1) of a school formed a large circle. From the first student, the number was counted by 1, 2, 3 and 4. When the last student finished the report, the first student continued to report down according to the law. A total of 6 circles were reported. When the seventh circle began, the first student reported how many, there was a formula, and then, explain why, talk about analysis
- 6. There are 47 students in a row. 1 to 3 count off, and the last student reports how many students are there in this team? The students who report one step forward and stand in a line?
- 7. 1999 students in a row, from the front to the end of the line 1 to 3, and then from the end of the line to the front 1 to 4 1999 students in a row, from the front to the end of the line 1 to 3, and then from the end of the line to the front 1 to 4. How many of them reported 1 twice
- 8. There are five students, each said a number, add up to an odd number. How many people said odd?
- 9. Observe the following group of numbers in regular order: - 1,2, - 3,4, - 5,6, - 7,8... Then what is the number 2006?
- 10. From one to six, every four numbers are combined. How many combinations are there How? Or what do you think? It's important to me
- 11. There are 120 five digits made up of 1, 2, 3, 4 and 5. Put these five digits in order from small to large, and the 95th number is______ .
- 12. How many five digits can you make up with 12345?
- 13. When to use combination formula and when to use permutation formula? Don't give me from Baidu Encyclopedia to get that entry to me, I want to tell me specifically, an example, I understand
- 14. How do these numbers find the rule 1, 2, 4, 8, 16, 32 Up to 64, how much does it add up to? What is the rule formula?
- 15. Observe the number of the following columns in order of + 2, - 4, + 6, - 8, + 10. According to its sorting rule, the number of 2012 should be?
- 16. The earliest mathematical masterpiece in the world is "nine chapters on arithmetic". What is the earliest "origin of species" in the world?
- 17. There is a mathematical Pythagorean theorem problem It is known that there are two fishing boats in port B. ship a and ship b set out at the same time. If ship a goes along the direction of 60 degrees north by east at a speed of 8 nautical miles per hour, ship B sails along the direction of 30 degrees south by East with a speed of 9 nautical miles per hour. Two hours later, ship a arrives at Island m and ship B sails to island P. please estimate the distance between island m and island P
- 18. Chinese mathematicians Who knows? Easy!
- 19. The definition of Pythagorean theorem, specific
- 20. The problem of calculating the area of double knobs by integral It seems that θ can't take pi / 4 to pi / 2? When drawing, is the graph in the first quadrant only 0 to pi / 4? So when integrating in polar coordinates, the upper limit of integration is pi / 4, right? And I still don't know whether the angle in polar coordinates is determined by the angle between the X axis and the X axis, and the graphs with angles not in the defined domain will not be drawn Although it seems that the graph is continuous, its value of θ is not continuous, is it? Thank you!