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6.25X5X25X16X0.8巧算

如图

125x16x25 =125x8x2x25 =1000x50 =50000

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

括号内先算,4-8为-4,4和25相乘为100,100乘125,为12500,加个负号,就是-12500

125x8x5x8x25 =1000x40x25 =1000x1000 =1000000

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