[unary equation]

Equations with unknowns, such as 3x+5=7.

Word decomposition

Unary explanation. The beginning of things. Han Dong's book "The Story of the Spring and Autumn Period and the Jade Ying": "The one who speaks a dollar is also great." Dong Zhongshu's Biography of Hanshu: The Spring and Autumn Annals means one yuan, which means that everything starts from the beginning, and the words of the Yuan people are called great. Those who say that one is one yuan, depending on the big start, want the original The Chinese interpretation of the "three-calendar equation" means that two mathematical formulas such as number, function, quantity and operation are equal, and there is usually an equal sign = detailed explanation between them. In the later Han Dynasty, the biography of Ma Yan was good at divination in nine chapters. Tang Note: "Liu Hui's divination in nine chapters is the first.