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简便方法：2.71×6.5+0.21×27.1+2.71
人气：297 ℃　时间：2020-03-20 10:08:47
解答
=2.71x6.5+2.1x2.71+2.71x1
=2.71x（6.5+2.1+1）
=2.71x9.6
=26.016
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