Question

12.5×66.4+37.5×11.2怎么简便运算？

Answer 1

12.5×66.4+37.5×11.2
=12.5×66.4+12.5×3×11.2
=12.5×66.4+12.5×33.6
=12.5×（66.4+33.6）
=12.5×100
=1250

Answer 2

12.5×66.4+37.5×11.2
=12.5×66.4+12.5x3×11.2
=12.5×66.4+12.5x33.6
=12.5x(66.4+33.6)
=12.5x100
=1250

Answer 3

通过观察可知后项中的37.5是前项中12.5的3倍，可以把37.5看成12.5×3，代入原式后提取公因数12.5，然后进行口算就很方便。具体计算过程如下：
12.5×66.4+37.5×11.2
=12.5×66.4+12.5×3×11.2
=12.5×（66.4+11.2×3）
=12.5×（66.4+33.6）
=12.5×100
=1250

Answer 4

原式=12.5×66.4+12.5×3×11.2
=12.5×66.4+12.5×（3×11.2）
=12.5×（66.4+33.6）
=12.5×100
=1250

Answer 5

可以使用乘法结合律简便计算
12.5×66.4+37.5×11.2
=12.5X66.4+12.5X3X11.2
=12.5X（66.4+3X11.2）
=12.5X100
=1250