7.29²-2.71²的简便计算

分类: 作业答案 • 2021-12-28 18:17:34

问题描述：

7.29²-2.71²的简便计算

答

7.29²-2.71²
=(7.29-2.71)(7.29+2.71)
=10(7.29-2.71)
=72.9-27.1
=45.8
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