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代数式求值问题是数学中的常见题型,各种类型的考试都有涉及.通过直接法和间接法两个方面对代数式求值问题进行探究,形成“巧妙变形,前后关联”的解题思路,并归纳出代数式求值问题的解法类型.通常变形后代入求值的方法有“整体代入”、“降次代入”、“参数法”.
Algebraic evaluation is a common problem in maths, and all kinds of tests are involved.Through the direct method and the indirect method, the problem of algebraic evaluation is explored to form the solution of “ingenious deformation, before and after” The main idea is to solve the problem of algebraic evaluation.At the same time, the methods of substituting and evaluating into algebra are as follows: “Substitute into ”, “Substitute into ”, “Parameter method ”.