作业帮7.29²-2.71²的简便计算
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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