51.2*23.4+35.9*48.8怎样用简便计算做(求详解)

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51.2*23.4+35.9*48.8怎样用简便计算做(求详解)51.2*23.4+35.9*48.8怎样用简便计算做(求详解)51.2*23.4+35.9*48.8怎样用简便计算做(求详解)51.2

51.2*23.4+35.9*48.8怎样用简便计算做(求详解)
51.2*23.4+35.9*48.8怎样用简便计算做(求详解)

51.2*23.4+35.9*48.8怎样用简便计算做(求详解)
51.2*23.4+35.9*48.8
=(50+1.2)* 23.4+(23.4+12.5)*(50 - 1.2)
=(50+1.2)*23.4+(50-1.2)*23.4+12.5 *(50 - 1.2)
=100*23.4+12.5*(50-1.2)
=2340+12.5 * 50 - 12.5*1.2
=2340+625-15
=2950

=51.2*23.4+48.8*(23.4+12.5)
=(51.2+48.8)*23.4+(50-1.2)*12.5
=2340+625-(120*125)/1000
=2950

51.2*23.4+35.9*48.8=51.2*23.4+35.9*(100—51.2)=
51.2*23.4—51.2*35.9+3590=3590+51.2*(23.4—35.9)=3590—51.2*12.5
=3590—51.2*(10+10/4)=3590—512—128=2950
过程写的比较详细,貌似挺复杂,其实道理很简单