7.29²-2.71²的简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 18:48:20
![7.29²-2.71²的简便计算](/uploads/image/z/1102786-34-6.jpg?t=7.29%26%23178%3B-2.71%26%23178%3B%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
7.29²-2.71²的简便计算
7.29²-2.71²的简便计算
7.29²-2.71²的简便计算
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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平方差公式
原式=(7.29+2.71)(7.29-2.71)
=10×4.58
=45.5
原式=(7.29+2.71)(7.29-2.71)
=10×4.58
=45.8