For example, the arrangement and combination of primary schools is mainly a row of numbers, and there is a relationship of addition, subtraction, multiplication and division between each adjacent number, and there is also a relationship of addition, subtraction, multiplication and division between two numbers.

For example: 1, 2, 3, 4, 5 (the relationship between every adjacent number increases 1).

1, 3, 2, 4, 3, 5, 4 (there is a space between every two numbers, plus 1 the relationship is increasing).

Junior high school involves other relationships between various numbers:

1, 2, 3, 5, 8 (the sum of the first two numbers is the third number)

1, 2,4,7, 1 1 (the difference between the two numbers is 1, 2,3,4).

And so on, many, many kinds, about the solution (I summed it up myself):

Confirm each number first, so as to find out whether there is a relationship between adjacent numbers.

Let's talk about the addition or subtraction of two numbers in a regular relationship, and get the difference between the two numbers.

Finally, it is ok to think about their relationship. . .