15.5+26.5-20.4 的简便计算
问题描述:
15.5+26.5-20.4 的简便计算
答
15.5+26.5-20.4
=11-20.4
=-9.4
15.5+26.5-20.4 的简便计算
15.5+26.5-20.4
=11-20.4
=-9.4