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2.9×0.45+0.29×4.2+0.029×13。用简便方法。

2.9×0.45+0.29×4.2+0.029×13 =2.9x(0.45+0.42+0.13) ...

2.9×0.45+0.29×4.2+0.029×13 =2.9×0.45+2.9×0.42+2.9...

2.9x0.45+0.29x4.2+0.029x13 =2.9*(0.45+0.42+0.13) ...

2.9×0.45+0.29×4.2+0.029×13 =2.9×0.45+2.9×0.42+2.9...

考虑考虑

0.029×(100×0.45+10×4.2+13)

2.9×0.45+0.29×4.2+0.029×13 =0.029X45+0.029X42+0.0...

2.9*0.45+0.29*4.2+0.029*13 =0.29*4.5+0.29*4.2+0.2...

2.9x0.45+0.29x4.2+0.029x13 =2.9x0.45+2.9x0.42+2.9...

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