二分之一减六分之一减十二分之一减二十分之一减三十分之一减四十二分之一等于多少啊?
展开全部
1/2-1/6-1/12-1/20-1/30-1/42
=1/2-1/20-1/12-1/30-1/6-1/42
=10/20-1/20-(1/12+1/30+1/6+1/42)
=9/20-(5/60+2/60+7/42+1/42)
=9/20-(7/60+8/42)
=9/20-7/60-4/21
=27/60-7/60-4/21
=20/60-4/21
=1/3-4/21
=7/21-4/21
=3/21
=1/7
=1/2-1/20-1/12-1/30-1/6-1/42
=10/20-1/20-(1/12+1/30+1/6+1/42)
=9/20-(5/60+2/60+7/42+1/42)
=9/20-(7/60+8/42)
=9/20-7/60-4/21
=27/60-7/60-4/21
=20/60-4/21
=1/3-4/21
=7/21-4/21
=3/21
=1/7
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询