来自介孟恩的问题
1/3+1/5+1/7+1/9+1/11+到1/39简便计算怎样算
1/3+1/5+1/7+1/9+1/11+到1/39简便计算怎样算
1回答
2020-05-14 22:49
1/3+1/5+1/7+1/9+1/11+到1/39简便计算怎样算
1/3+1/5+1/7+1/9+1/11+到1/39简便计算怎样算
1/3+1/5+1/7+1/9+1/11+到1/39
=(1-1/3+1/3-1/5+.1/37-1/39)/2
=(1-1/39)/2
=76/39