42/1+56/1+72/1+90/1+110/1
问题描述:
42/1+56/1+72/1+90/1+110/1
答
42/1+56/1+72/1+90/1+110/1
=1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11
=1/6-1/11
=5/66
=66分之5