简便方法:2.71×6.5+0.21×27.1+2.71
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简便方法:2.71×6.5+0.21×27.1+2.71
简便方法:2.71×6.5+0.21×27.1+2.71
简便方法:2.71×6.5+0.21×27.1+2.71
=2.71x6.5+2.1x2.71+2.71x1
=2.71x(6.5+2.1+1)
=2.71x9.6
=26.016
简便方法:2.71×6.5+0.21×27.1+2.71
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