6.4×4.5+3.6×45的简便计算
问题描述:
6.4×4.5+3.6×45的简便计算
急.
答
6.4×4.5+3.6×45
=0.64×45+3.6×45
=45×(0.64+3.6)
=45×4.24
=190.8