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79×5/74用简便计算..................

=(74+5)✘5/74 =74✘5/74+5✘5/74 =5+25/74 =5又25/74

75乘74分之5 =(74+1)乘74分之5 =5+74分之5 =5又74分之5

74×85+74×5 =74×(85+5) =74×90 =6660

5.74×9.9+57.4 =5.74×10-5.74×0.1+57.4 =57.4+57.4-0.574 =114.8-0.574 =114.226

答:5.74x99+5.74 =5.74*(99+1) =5.74*100 =574

用简便计算,15.74一9.81一5.74等于多少? 15.74一9.81一5.74 =15.74-5.74-9.81 =10-9.81 =0.19

①26×5+74×5+5 =(26+74)×5+5=500+5=505②6.74+12.62+24.38+3.26=(6.74+3.26)+(12.62+24.38)=10+37=47③0.89×4.8+5.2×0.89 =0.89×(4.8+5.2)=0.89×10=8.9④0.4×99+0.4 =0.4×(99+1)=0.4×100=40⑤34.5-(17.2+4.5)=34.5-4.5-17.2=30-17.2=12.8...

用简便方法来计算下面各题 25×5+74×5+5 =(25+74+1)×5 =100×5 =500

10.74-5.5+3.74 =5.24+3.74 =8.98

5.74×99+5.74 =5.74×(99+1) =5.74×100 =574

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