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2.9×0.45+0.29×4.2+0.029×13。用简便方法。

解:2.9*0.45+0.29*4.2+0.029*13=29*45*0.001+29*42*0.001+29*13*0.001=29*0.001*(45+42+13)=29*0.001*100=29*0.1=2.9

2.9*0.45+0.29*4.2+0.029*13=2.9*0.45+2.9*0.42+2.9*0.13=2.9*(0.45+0.42+0.13)=2.9*1=2.9

2.9*0.45+ 0.29*4.2 +0.029*13=0.29*4.5+ 0.29*4.2 +0.29*1.3=0.29*(4.5+4.2+1.3)=0.29*10=2.9

=0.029x100x0.45+0.029x10x0.45+0.029x13=0.029x(4.5+4.5+13)=0.029x22=0.638求采纳

=0.29x(10x0.45+4.2+0.1x13)=0.29x(4.5+4.2+1.3)=0.29x10=2.9

=0.029*45+0.029*42+0.029*13=0.029*(45-42+13)=2.9

2.9*0.45+0.29*4.2+0.029*13可以这样理解=2.9*0.45+2.9*0.42+2.9*0.13=2.9*(0.45+0.42+0.13)=2.9*1=2.9

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