10.91/（1.3乘以28）的简便算法是?
问题描述：
10.91/（1.3乘以28）的简便算法是?
答
10.91/（1.3*28）
=10.91/{1.3*(30-2)}
=10.91/(39-2.6)
=10.91/36.4
=1091/3640