3.6×25.4+37.9×6.4

来源：百度知道编辑：UC知道时间：2024/05/04 16:10:34

这是一道奥数题
用乘法分配率

3.6×25.4+37.9×6.4
=3.6×25.4+(25.4+12.5)×6.4
=3.6×25.4+25.4×6.4+12.5×6.4
=3.6×25.4+25.4×6.4+12.5×8×0.8
=25.4×(3.6+6.4)+100×0.8
=254+80
=334

用计算器！

3.6×25.4+37.9×6.4
=3.6×25.4+（25.4+12.3）×6.4
=3.6×25.4+25.4×6.4+12.3×6.4
=（3.6+6.4）×25.4+12.3×6.4
=254+12.3×6.4
=254+78.72
=332.72
简便了一些，但好象还有更好的方法

3.6×25.4+37.9×6.4
=3.6×25.4+（25.4+12.3）×6.4
=3.6×25.4+25.4×6.4+12.3×6.4
=（3.6+6.4）×25.4+12.3×6.4
=254+12.3×6.4
=254+78.72
=332.72