Question

2.5×1.4的简便方法？

Answer 1

原式=2.5×1.4
=2.5×2×0.7
=5×0.7
=3.5
请采纳，谢谢。

Answer 2

2.5×1.4
＝2.5×(1+0.4)
＝2.5×1＋2.5×0.4
＝2.5+1
＝3.5

Answer 3

2.5×1.4=5/2×7/5=7/2=3.5

Answer 4

2.5×1.4
=2.5×0.4+2.5×1
=1+2.5
=3.5

Answer 5

改变一下，变成2.5×1+2.5×0.4。所以等于2.5+1=3.5。