0.7470.25+0.530.025-2.5*0.04

分类: 作业答案 • 2021-12-16 21:59:08

问题描述：

0.747*0.25+0.53*0.025-2.5*0.04
巧算：0.747*.25+0.53*0.025-2.5*0.

答

0.747*.25+0.53*0.025-2.5*0.04
=0.747*0.25+0.053*0.25-0.25*0.4
=(0.747+0.053-0.4)*0.25
=0.4*0.25
=0.1

0.747*0.25+0.53*0.025-2.5*0.04