所谓“整体代换”,就是把某个数学式子用一个新的量代换,依此出发,注意整体结构及结构的改造,再适当作恒等变形,常可迅速地达到求解的目标,使问题的解答简洁.而“整体代换”的思想在解数学题时有多方面的应用. The so-called “overall replacement” is to replace a certain mathematical formula with a new quantity. From this point of departure, attention should be paid to the transformation of the overall structure and structure, and then appropriate transformations can be made to achieve the goal of solution quickly. The solution to the problem is concise. The idea of ​​“total substitution” has many applications in solving mathematics problems.