计算: 1/1×5+1/5×9+1/9×13+1/13×17+1/17×21+1/21×25 456+979×455/456×979—523
2个回答
展开全部
1/1×5+1/5×9+1/9×13+1/13×17+1/17×21+1/21×25
=(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21+1/12-1/25)÷4
=(1-1/25)÷4
=24/25÷4
=6/25
(456+979×455)/(456×979—523)
=( 456+979×455)/(455×979+979—523 )
=(456+979×455)/(455×979+456)
=1
=(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21+1/12-1/25)÷4
=(1-1/25)÷4
=24/25÷4
=6/25
(456+979×455)/(456×979—523)
=( 456+979×455)/(455×979+979—523 )
=(456+979×455)/(455×979+456)
=1
2011-12-23
展开全部
正确啊!!!!!
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