3.6 2.5+0.42 25+2×0.25简便计算
问题描述:
3.6 2.5+0.42 25+2×0.25简便计算
十万火急!
答
=3.6*2.5+4.2*2.5+0.2*2.5
=(3.6+4.2+0.2)*2.5
=8*2.5
=20