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401×25%=?简便计算

400×25+25

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

=25(401-1) =25*400 =10000

=400×25+1×25-25=10000

简便方法计算 401x25 =400×25+25 =10000+25 =10025

变成 (363+1)+(401-1) =364+400 =764

2.5×401-2.5 =(401-1)×2.5 =400×2.5 =1000

0.25x401 =0.25x(400+1) =0.25x400+0.25x1 =100+0.25 =100.25

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

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