2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
问题描述:
2.5×3.9+25简算````2.5×3.9+25简算````2.5×3.9+25简算````
答
2.5×3.9+25
=2.5×(4-0.1)+25
=10+25-0.25
=34.75