1.8÷0.25+2.2×0.25简便算法
问题描述:
1.8÷0.25+2.2×0.25简便算法
求求你
答
(2-0.2)/0.25 + (2+0.2)*0.25 =
(2-0.2)*4 + (2+0.2)/4 =
2x4 - 0.2x4 + 2/4 + 0.2/4 =
8 - 0.8 + 0.5 + 0.05 =
8 - 0.25 = 7.75为什么有个4?