在初中所学的许多数学题中,有些复杂的问题,若用常规思维很难解决问题,但想到把已知和未知的位置对调,运用常值代换法,则往往会出奇制胜,解数学题中这种反客为主、常值代换的解题策略,常常会使解题出现奇迹。 Among the many mathematics subjects studied in junior high school, some complex problems, if it is difficult to solve the problem with conventional thinking, but the use of constant value substitution method when thinking about the position of known and unknown, will often surprise the winner and solve math problems. This problem-solving strategy based on countermeasures and constant substitution often leads to miracles in the problem solving.