2.8乘4.6减3.68的简便运算

问题描述:

2.8乘4.6减3.68的简便运算

2.8×4.6-3.68
=2.8×4.6-4.6×0.8
=﹙2.8-0.8﹚×4.6
=2×4.6
=9.2