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(47×21×75×102)÷(11.5×45×1.4×51)简便算法

(47×21×75×102)÷(11.5×45×1.4×51) =(47×2×75×2)÷(45×1.4) =(47×2×75×2)÷(5×3×3×2×0.7) =(47×2×5)÷(3×0.7) =470÷2.1 =

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