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27.5 1.4的简单计算

27.5*1.4 用简便方法计算27.5*1.4 =27.5*2*0.7=45*0.7=31.5

27+249+51+172=(249+51)+(27+172+1)-1=300+200-1=499

38.5

=27.5*201-27.5*1=27.5*(201-1)=27.5*200=5500求采纳

27.5*1.4=38.50

49*1.4=(50-1)*1.4=50*1.4-1*1.4=70-1.4=68.6

27.5*1.4=27.5*(1+0.4)=27.5+11=38.5

解:2.8*(2.25+27.5/1.5) =57.6333333亲,请您采纳,您的采纳是我的动力,谢谢.

根据乘法分配律,27.5x3.7一7.5x3.7=(27.5-7.5)x3.7=20x3.7=74

用简便方法计算: 27.5-55*12.5+12.5=(27.5-12.5)^2=15^2=225

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