51.2*23.4+35.9*48.8怎样用简便计算做(求详解)
人气:117 ℃ 时间:2020-01-03 22:43:20
解答
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
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