81/1+81/3+81/5+81/7+81/9+81/11+81/13+81/15+81/17=
问题描述:
81/1+81/3+81/5+81/7+81/9+81/11+81/13+81/15+81/17=
简便计算,
答
81/1+81/3+81/5+81/7+81/9+81/11+81/13+81/15+81/17
=(81/1+81/17)×9÷2
=9/2×9÷2
=1