2.6×0.39+2.7×0.38+2.8×0.37求和的简便算法_数学解答

2.6×0.39+2.7×0.38+2.8×0.37求和的简便算法

人气：264 ℃　时间：2020-04-28 08:19:43

解答

（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