1.25×0.25×4×0.4的简便运算？

Question

如题所述

Answer 1

1.25*0.25*4*0.4
＝（1.25*0.4）*（0.25*4）
＝0.5*1
＝0.5

Answer 2

1.25×4×0.25×0.4
=5×0.1
=0.5