Question

1.25x4ⅹ0.8ⅹ2.5脱式计算？

Answer 1

运用乘法交换律和结合律。
1.25×4×0.8×2.5
=(1.25×0.8)×(4×2.5)
=1×10
=10

Answer 2

=1.25×0.8×4×2.5
=1×10=10

Answer 3

1.25x4x0.8x2.5＝1.25x0.8x4x2.5＝1x10＝10。