3.89×2.1+38.9×0.21怎么简算?

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3.89×2.1+38.9×0.21怎么简算?3.89×2.1+38.9×0.21怎么简算?3.89×2.1+38.9×0.21怎么简算? 

3.89×2.1+38.9×0.21怎么简算?
3.89×2.1+38.9×0.21怎么简算?

3.89×2.1+38.9×0.21怎么简算?