7.2x3.2+6.4x1.9-3.2能不能巧算
问题描述:
7.2x3.2+6.4x1.9-3.2能不能巧算
急
答
7.2x3.2+6.4x1.9-3.2
=7.2x3.2+3.2x2x1.9-3.2
=7.2x3.2+3.2x3.8-3.2
=(7.2+3.8-1)x3.2
=10x3.2
=32