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中学数学中的方差公式在数学解题中有着极其广阔的应用价值,然而由于统计初步列入中学数学时间不长,因而有关方差公式在数学解题中的应用资料甚少.为延伸教材内容、紧跟素质教育和新课程改革的步伐,下面我们以部分竞赛题为例,将方差公式在求代数式的取值范围问题中的应用举例介绍如下,供中学师生参考.1方差公式引理
The formula of variance in middle school mathematics has a very broad application value in the mathematics problem solving. However, since the statistics are initially included in the middle school mathematics for a short time, the application of the variance formula in the mathematics problem solving is rarely used. Following the steps of quality education and new curriculum reform, we will use the partial competition as an example to introduce the application of the variance formula in the problem of finding algebraic range of values as follows, for reference by middle school teachers and students. 1 Variance Formula Lemma