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简单的代数式求值,将条件(已知)直接代入结论(求值算式)就可求出代数式的值。但较复杂的代数式求值,若能巧用化归与转化的数学思想会收到事半功倍之效果。
Simple algebraic expressions can be obtained by substituting the condition (known) directly into the conclusion (evaluation formula). However, the more complex algebraic expressions, if they can be used mathematically and transformational mathematical ideas will receive more effective results.