2.5*3.79*0.4 简便计算
问题描述：
2.5*3.79*0.4 简便计算
答
2.5*0.4*3.79
答
2.5*0.4*3.79 =1*3.79=3.79
答
2.5*3.79*0.4
=2.5*0.4*3.79
=1*3.79
=3.79