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401乘287简便算法如何用简便方法计算

0.75×401 =(400+1)×0.75 =400×0.75+1×0.75 =300+0.75 =300.75

400×25+25

401一203简便计算 =401一(200+3) =401一200一3 =201一3 =198

怎么简式算

原式 =401² =(400+1)² =400²+1²+2x400x1 =160000+1+800 =160801 供参考。

401×75,用简便方法计算 =400×75+75 =30000+75 =30075

45*4275*401 =45*4275*400+45*4275 =50*4275*400-5*4275*400+50*4275-5*4275 =20000*4275-2000*4275+50*4275-5*4275 =4275*(20000-2000+50-5)

401-(150-99) =401-150+99 =401+99-150 =500-150 =350

如图

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