2/3-6/5+12/7-20/9+30/11-42/13+56/15 简算

2/3-6/5+12/7-20/9+30/11-42/13+56/15 简算
2/3-6/5+12/7-20/9+30/11-42/13+56/15 简算

2/3-6/5+12/7-20/9+30/11-42/13+56/15 简算
题目都写错...
3/2-5/6+7/12-9/20+11/30-13/42+15/56
=1+1/2-1/2-1/3+1/3+1/4……+1/7+1/8
=1又1/8