简便计算:7/11+5/9+4/9+4/11
问题描述:
简便计算:7/11+5/9+4/9+4/11
答
=(7/11+4/11)+(5/9+4/9)
=1+1=2
答
(7/11+4/11)+(4/9+5/9)=2
答
=(7/11+4/11)+(5/9+4/9)=1+1=2
答
=(7/11+4/11)+(5/9+4/9)
=1+1
=2
答
=(7/11+4/11)+(5/9+4/9)=2