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学习了方差公式,学生往往只局限于具体的计算之中,没有体会个中奥妙,实际上方差公式在数学解题中有很好的应用价值,在此向同学们介绍一二.
After learning the formula of variance, students are often confined to specific calculations. They do not appreciate the subtleties. In fact, the formula of variance has a very good application value in mathematical problem solving.