1/6+1/12+1/36+1/66+1/99=?
问题描述:
1/6+1/12+1/36+1/66+1/99=?
123
答
1/6+1/12+1/36+1/66+1/99
=(1/6+1/66)+(1/12+1/36)+1/99
=2/11+1/9+1/99
=10/33