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6.25X5X25X16X0.8巧算

如图

=(125x8)5x(4x25)=1000×5×100=500000

125x8x5x8x25 =1000x40x25 =1000x1000 =1000000

(125x8)x25+125×(4x25) =1000x25+125x100 =25000+12500 =37500

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