1, Tian Fang: It is mainly about the calculation of field area and scores, and it is the earliest book in the world that systematically describes scores.

2. Xiaomi: It is mainly the calculation method of grain trade, which involves many proportional problems.

3. Decay: The main content is the algorithm of distribution ratio.

4. Shao Guang: Mainly talk about the methods of square root and square root.

5. Business work: mainly engineering mathematics problems such as earthwork and labor consumption, mainly volume calculation.

6. lose-lose: more complicated proportional issues such as taxation.

7. Insufficient profit: the problem of dual management.

8. Equation: It is mainly the solution of linear equations and the addition and subtraction of positive and negative numbers, which is the first time in the history of mathematics in the world.

9. Pythagorean Theorem: Application of Pythagorean Theorem.