If the number of a column arranged according to a certain rule is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, then the ninth number should be --------?

If the number of a column arranged according to a certain rule is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, then the ninth number should be --------?

2 = 1 + 1, 3 = 2 - 1, 10 = 3 + 1, 15 = 4 - 1, 26 = 5 + 1, the law is: the nth number: n is even number: n - 1, n is technology: n + 1, the ninth number is: 9 + 1 = 82

1, 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
2=1²+1
3=2²-1
10=3²+1
15=4²-1
26=5²+1
35=6²-1
So the nth number is N 2 + (- 1) ^ (n + 1)

The number of a column arranged according to a certain rule is 2,3,10,15,26,35 The seventh number in this column is ()

Olympiad kills people! 50
2 = 1 square + 1
3 = 2 square - 1
10 = 3 square + 1
15 = 4 Square-1
26 = 5 square + 1
35 = 6 square - 1
7 square + 1 = 50
The seventh number is 50

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 in a row arranged according to a certain rule is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35... In turn, the seventh digit?

1/50
The rule is 1 / [n ^ 2 - (- 1) ^ n]

Observe the number of columns in order, 2, - 4, 6, - 8, + 10 According to its arrangement, the 100th number should be______ .

According to the special case given, the nth number is (- 1) n + 12n
Then the 100th number is - 2 × 100 = - 200
So the answer is: - 200

Observe the number in the following column and fill in the appropriate number on the horizontal line according to a certain rule: 1,3,5 / 9,7 / 16___ ,___ Then the nth number is________ .

The square of 2N-1

Observe the number in the following column and fill in the appropriate number on the horizontal line according to a certain rule: 1,3 / 4,5 / 9,7 / 16____ ,_____ Then the nth number is?

9/25, 11/36
The nth number is (2n-1) / N

Observe the number in the following column. According to the rule, fill in the appropriate numbers on the horizontal line: 2 / 3, - 4 / 5,9 / 7,8 / 9___ ,___ 14 out of 15 Observe the number in the following column. According to the law, fill in the appropriate numbers on the horizontal line: 2 / 3, - 4 / 5, 6 / 7, 8 / 9___ ，___ 14 out of 15 Nine out of seven of the questions are wrong. It should be six out of seven Add a question Look at the number in the following column and explore the rules 1 / 2, 2 / 3, 3 / 4, 4 / 5, 5 / 6 (1) Write the three numbers of items 8, 9 and 10 (2) What is the number 2011? What is the number 2012?

ten-elevenths
-12 out of 13

Observe the number of each column below, according to a certain rule, the proper number on the horizontal line, and explain your reason. (4) - 2, - 4,0, - 2,2, () ()

0,4