Question

2.5乘3.9乘40的简便算法？

Answer 1

计算如下：
2.5乘3.9乘40
=2.5×3.9×40
=2.5×40×3.9
=100×3.9
=390

Answer 2

2.5×3.9×40
=2.5×40×3.9
=100×3.9
=390

Answer 3

2.5×3.9×40的简便算法
2.5×3.9×40
=2.5×40×3.9
=100×3.9
=390