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所谓消去法,就是由一些元素间的已知等量关系,通过恒等变换,消去一些元素,得出另一些元素间的等量关系。下面举几例来说明消去法的应用: 例1(求值)已知:lg507=2.7050,lg11.7=1.0682.求lg13。
The so-called elimination method consists of the known equal relationship between some elements. Through the equivalence transformation, some elements are eliminated and the equal relationship between other elements is obtained. Here are a few examples to illustrate the application of the elimination method: Example 1 (Evaluation) is known: lg507=2.7050, lg11.7=1.0682. Seek lg13.