Question

3.5×0.25×1.4的简便算法

Answer 1

3.5×0.25×1.4=1.225
0.25×1.4=0.35
0.25×0.4=0.1
3.5×0.35=1.225

Answer 2

3.5×0.25×1.4
=3.5×[0.25×（1+0.4）]
=3.5×（0.25×1+0.25×0.4）
=3.5×（0.25+0.1）
=3.5×0.35
=1.225