Question

15.9×3.9×0.8这道题怎么简便计算？

Answer 1

15.9*3.9*0.8简便计算：
=16*3.9*0.8-0.1*3.9*0.8
=16*3.12-0.1*3.12
=49.92-0.312
=49.608

Answer 2

原式＝(16-0.1)×(4-0.1)×8×0.1＝(1.6-0.01)×(32-0.8)＝1.59×31.2＝49.608，希望采纳。