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简便算法 3.5x2.7一35x0.73

你好: 3.5x2.7+35x0.73 =35×0.27+35×0.73 =35×(0.27+0.73) =35×1 =35

3.5x2.7+35x0.73=3.5x2.7+3.5x7.3=3.5x(2.7+7.3)=3.5x10=35

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