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变量范围是变量存在或不存在的前提．它通常以文字或数值形式表现出来，并与变量紧密相连，不可分割，因而，在研究数学问题时，我们一定要认真讨论变量的范围，时时不忘变量范围对变量的限制，这就是变量的范围意识．然而，我们往往忽视对这一基本意识的培训，缺乏对变量...
The variable range is a precondition for the existence or nonexistence of a variable. It is usually expressed in words or numerical forms, and it is closely related to variables. It is inseparable. Therefore, when we study mathematical problems, we must seriously discuss the scope of variables, and always keep in mind the limits of variables on variables. This is the variable. Range awareness. However, we often neglect training on this basic awareness, lack of variables...