First of all, Jiugongge can be used to solve the Sudoku problem. Sudoku is a logical reasoning game. The goal is to fill a 9x9 square with the number 1-9, so that each row, column and 3x3 square contains the number 1-9, and each number can only appear once. Jiugongge provides a structured framework that enables us to break down the problem into smaller parts to solve it.

Secondly, Jiugongge can be used to solve Latin problems. Latin square matrix is n×n square matrix, in which the elements of each row and column are unique. Jiugongge is a 3x3 Latin square, which can be used to show and solve the properties and construction methods of Latin square.

In addition, nine squares can also be used to solve the combination problem. For example, given a set of 9 different elements, we can use Jiugongge to display and solve all possible combinations of these elements. By observing the arrangement and combination in the nine squares, we can find different solutions and modes.

Finally, Jiugongge can also be used to represent some basic concepts and relationships in mathematics. For example, it can be used to show the arrangement of numbers in the multiplication table and the relationship between addition and subtraction of numbers. The structure of Jiugongge can help us better understand and visualize some concepts and relationships in mathematics.

To sum up, Jiugongge is widely used in mathematics, including solving Sudoku problem, Latin square problem, combination problem and showing mathematical concepts and relationships.