Ji Guangyang 
Addition, Subtraction, Multiplication and Division of Life 

The concept of mathematics has been upgraded, our ages have increased, and our understandings of life have gradually become complicated from addition, subtraction, multiplication and division in childhood, to factorization in middle school, to objective function and calculus in college. Although the constants and variables of life are difficult to calculate and grasp, the general ways of life could be solved by adding, subtracting, multiplying and dividing elementary arithmetic.Although the constants and variables of life are difficult to calculate and grasp, the general ways of life could be solved by adding, subtracting, multiplying and dividing elementary arithmetic.