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7.29²-2.71²的简便计算
人气:405 ℃ 时间:2020-03-20 05:54:31
解答
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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