What is the law of 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35, 1 / 50?

What is the law of 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35, 1 / 50?

Look at the denominator, ^ 2 is the square
2=1^2+1
3=2^2-1
10=3^2+1
15=4^2-1
26=5^2+1
35=6^2-1
So the next number is 7 ^ 2 + 1 = 50, which is 1 / 50

Fill in the numbers regularly in the fifth grade
27/64,9/16,3/4,（ ）,4/3,（ ）,（ ）

If the common ratio is 4 / 3, the first number multiplied by 4 / 3 is equal to the second number 1, 16 / 9, 64 / 27

Fill in the numbers regularly in the third grade
6 13 27 49 ( ) ( )
6 15 38 65 106 ( ) ( )
6 13 27 49 () 121 () the first word is missing

The law of 6 13 27 49 (80) 121 (173) is 6 15 38 65 106 (151) (210) 6 13 27 49 () 121 () is as follows: 6 + 7 = 1313 + 14 = 2727 + 22 = 49. From their addends, we can get the following law: 7 + 7 = 14 14 + 8 = 22 + 9 = 31 + 10 = 41 + 11 = 52