5/4+9/7+9/2+1.2=()用简便方法计算
问题描述:
5/4+9/7+9/2+1.2=()用简便方法计算
答
5/4+9/7+9/2+1.2
=(5/4+1.2)+(9/7+9/2)
=2+1
=3