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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

25x5+74x5+5 =5x(25+74+1) =5x100 =500

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

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...

解:5.74+0.7*1.3 =5.74+(1-0.3)*1.3 =5.74+1.3-0.39 =7.04-0.39 =6.04+1-0.39 =6.04+0.61 =6.65

5.74*1.8/0.2 =5.74*(1.8/0.2) =5.74*9 =5.74*(10-1) =57.4-5.74 =51.66

这是个移火柴题目吧,7上的一横移到3左边,使3变成9,等式变成9+5=14

74.825-(26.5+2.85×0.3) =74.825-(26.5+0.855) =74.825-27.355 =47.47 不能简便

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