1/6+1/24+1/60+1/120+1/210的简便计算
问题描述:
1/6+1/24+1/60+1/120+1/210的简便计算
答
没有吧.
如果你要答案,还是按部就班地算吧.
1/6+1/24+1/60+1/120+1/210
=140/840+35/840+14/840+7/840+4/840
=200/840=5/21