简便方法计算下面各题.(快的给50分)!5392+3997 7362-2999 62.4÷2.5÷0.4125÷(50÷8) 7.2x10.1 (100-1.25)x812.5x56 8÷125 (25+125)x893x51x51x51x6

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简便方法计算下面各题.(快的给50分)!5392+39977362-299962.4÷2.5÷0.4125÷(50÷8)7.2x10.1(100-1.25)x812.5x568÷125(25+125)

简便方法计算下面各题.(快的给50分)!5392+3997 7362-2999 62.4÷2.5÷0.4125÷(50÷8) 7.2x10.1 (100-1.25)x812.5x56 8÷125 (25+125)x893x51x51x51x6
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

简便方法计算下面各题.(快的给50分)!5392+3997 7362-2999 62.4÷2.5÷0.4125÷(50÷8) 7.2x10.1 (100-1.25)x812.5x56 8÷125 (25+125)x893x51x51x51x6
5392+3997=5392+4000-3=9389
7362-2999=7362-3000+1=4363
62.4÷2.5÷0.4=62.4÷(2.5×0.4)=62.4÷1=62.4
125÷(50÷8)=125÷50×8=125×8÷50=1000÷50=20
7.2x10.1 =7.2×(10+0.1)=7.2×10+7.2×0.1=72+0.72=72.72
(100-1.25)x8=100×8-1.25×8=800-10=790
12.5x56= 12.5×8×7=100×7=700
8÷125 =(8×8)÷(125×8)=64÷1000=0.064
(25+125)x8=25×8+125×8=200+1000=1200