1/30+1/42+1/56+1/72+1/90+1/110简便算法(过程)
问题描述:
1/30+1/42+1/56+1/72+1/90+1/110简便算法(过程)
答
1/30+1/42+1/56+1/72+1/90+1/110
=(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)+(1/10-1/11)
=1/5-1/11
=6/55