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综观近年各类数学竞赛试卷,有关完全平方式的题目屡见不鲜.常用的公式有: ①完全平方公式:a2±2ab+b2=(a±b)2. ②三项式完全平方公式:a2+b2+c2+2ab+2bc+2ca=(a+b+c)2. 由此得到的变形公式有:
Looking at various mathematics competition examination papers in recent years, the topic of completely flat patterns is not uncommon. The commonly used formulas are as follows: 1 Complete square formula: a2±2ab+b2=(a±b) 2. 2 Trinomial complete square formula: a2+b2 +c2+2ab+2bc+2ca=(a+b+c) 2. The resulting deformation equations are: