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脱式计算:一、用简便方法计算。26×28×(26×1/27+27×1/28) = = = =

原式=26x28x1/26x27+26x28x1/27x28 =2

脱式计算. 408-12×24 (46+28)×60 42×50-1715÷5 32+

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