0.45+0.25×0.2+0.8用简便方法计算

0.45+0.25×0.2+0.8用简便方法计算
2025-05-24 01:27:14
推荐回答(1个)
回答(1):

0.45+0.25×0.2+0.8
=0.25+0.2+0.25*0.2+0.8
=0.25(1+0.2)+(0.2+0.8)
=0.25*1.2+1
=0.3+1
=1.3