How to express addition, subtraction, multiplication and division in Chinese poetry

1, China's poem Luo Zhong occasionally represents the plus sign. The poet counts his fifteen years of experience as an official and counts six figures, and the sum is 15.5.

2. One hundred and thirty rhymes in the poem of Youwu Town represent subtraction, and two formulas are listed in the poem: 5 1-37= 14, 14-6=8.

3. Wine can represent multiplication. This poem is multiplied by the number of months in a year. The formula is 12× 3 = 36.

4. Qujiang's early autumn can represent division, 50 has declined, 20 has been infatuated, and the day and night are equally divided. What is the geometric time during the period? "It is a mixed operation problem that uses division to get the final result.