巧用变量代换解题林雪松（重庆市巴南成人中专６３１３２０）变量代换在数学解题中有着广泛的运用，被称为是解决数学问题的有力杠杆．解数学题时灵活地运用各种变量代换能起到转变形式，转移知识点，化难为易，化繁为简，变未知为已知的作用．变量代换的形式比较多，下面... Clever use of variable substitution problem Lin Xuesong (Chongqing Banan Adult Technical College 631320) Variable substitution has a wide range of applications in mathematical problem solving and is known as a powerful lever for solving mathematical problems. Solving mathematics problems flexibly using a variety of variable substitution can play a transformative form, transfer knowledge points, make it difficult to understand, simplify and simplify, change the unknown to a known role. Variable substitution form is more, below...