简算：2..25×1.8+1.25×0.18

分类: 作业答案 • 2021-12-20 01:28:30

问题描述：

答

(10*9+5*0.9)/20
=10.5/20
=2.1/4
=0.5025

答

2.25*1.8+1.25*0.18
=2.25+2.25*0.8+0.125+1.25*0.08
=2.375+0.18+0.1
=2.655

答

2.25×1.8+1.25×0.18 = 2.25×1.8+1.25×1.8/10 = 2.25×1.8+0.125×1.8 = (2.25 + 0.125 )*1.8 =2.375 * 1.8 =4.275