3.8+2.2×(0.7×0.3)简便运算

问题描述:

3.8+2.2×(0.7×0.3)简便运算

3.8+2.2×(0.7×0.3)
=3.8+2.2*0.21=3.8+(2+0.2)*0.21=3.8+0.42+0.042=4.22+0.042=4.262