Question

要用简便计算。

Answer 1

1.25*0.8结果是1，所以换下乘数的位置 答案为3.8！

Answer 2

1.25×3.8×0.8
=1.25×0.8×3.8
=1×3.8
=3.8

Answer 3

1.25x0.8x3.8

Answer 4

1.25×0.8×3.8＝3.8

Answer 5

化成分数