Question

1.25×1.6×0.5的简便计算？

Answer 1

因为1.6=8×0.2，所以原式等于1.25×8×0.2×0.5，运用乘法结合律改变运算顺序结果保持不变，就有（1.25×8）×（0.2×0.5）=10×0.1=1

Answer 2

1.25×1.6×0.5
=1.25×8×0.2×0.5
=（1.25×8）×（0.2×0.5）
=10×0.1
=1