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13x25x4怎样简便计算公式

13×25×4 =13×(25×4) =13×100 =1300

138×25×4 =138×(25×4) =138×100 =13800 简便方法计算,首先...

原式 =(125x8)x(25x4) =1000x100 =100000 供参考。

380+47x25x4用简便方法计算 380+47x25x4 =380+47x(25x4) =...

(25×6)(25×4)

51X25X4 =51×(25×4) =51×100 =5100

45X25X2X4 =45*2*(25*4) =90*100 =9000

(30×25)×2×4 =(30×2)×(25×4) =60×100 =6000

解:采用结合律, 原式=137x4x25 =137x(4x25) =137x100 =13700

25x125x4简便计算 =25×4×125 =100×125 =12500

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