简便方法计算下面各题.(快的给50分)!

问题描述:

简便方法计算下面各题.(快的给50分)!
5392+3997 7362-2999 62.4÷2.5÷0.4
125÷(50÷8) 7.2x10.1 (100-1.25)x8
12.5x56 8÷125 (25+125)x8
93x51x51x51x6

5392+3997=5392+4000-3=93897362-2999=7362-3000+1=436362.4÷2.5÷0.4=62.4÷(2.5×0.4)=62.4÷1=62.4125÷(50÷8)=125÷50×8=125×8÷50=1000÷50=207.2x10.1 =7.2×(10+0.1)=7.2×10+7....要有过程都有过程的