2.6×0.39+2.7×0.38+2.8×0.37求和的简便算法

问题描述:

2.6×0.39+2.7×0.38+2.8×0.37求和的简便算法

(2.7-0.1)×(0.38+0.01)+2.7×0.38+(2.7+0.1)×(0.38-0.01)
=2.7×0.38×3-2×0.1×0.01
=3.076