3.9乘0.54简便计算
问题描述:
3.9乘0.54简便计算
答
3.9X0.51=(4-0.1)X(0.5+0.1)=4X0.5+4X0.1-0.1X0.5-0.1X0.1=2+0.4-0.05-0.01 =2.34
3.9乘0.54简便计算
3.9X0.51=(4-0.1)X(0.5+0.1)=4X0.5+4X0.1-0.1X0.5-0.1X0.1=2+0.4-0.05-0.01 =2.34