12.5乘以0.25加1.25乘7.5用简便计算怎么算?
问题描述：
12.5乘以0.25加1.25乘7.5用简便计算怎么算?
简便计算
答
12.5×0.25＋1.25×7.5
=1.25×2.5＋1.25×7.5
=1.25×（2.5+7.5）
=1.25×10
=12.5