2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
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2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````2.5×
2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
2.5×3.9+25
=2.5×（4-0.1）+25
=10+25-0.25
=34.75
2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
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